• 722 can be written using four 4's:

722 has 6 divisors (see below), whose sum is σ = 1143. Its totient is φ = 342.

The previous prime is 719. The next prime is 727. The reversal of 722 is 227.

722 is nontrivially palindromic in base 16.

722 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 361 + 361 = 19^2 + 19^2 .

It is an ABA number since it can be written as A⋅B^{A}, here for A=2, B=19.

It is an Ulam number.

It is a Duffinian number.

722 is an undulating number in base 16.

722 is strictly pandigital in base 5.

It is a nialpdrome in base 9, base 10 and base 15.

It is not an unprimeable number, because it can be changed into a prime (727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 29 + ... + 47.

722 is a deficient number, since it is larger than the sum of its proper divisors (421).

722 is a wasteful number, since it uses less digits than its factorization.

722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40 (or 21 counting only the distinct ones).

The product of its digits is 28, while the sum is 11.

The square root of 722 is about 26.8700576851. The cubic root of 722 is about 8.9711007185.

Adding to 722 its reverse (227), we get a palindrome (949).

It can be divided in two parts, 72 and 2, that multiplied together give a square (144 = 12^{2}).

The spelling of 722 in words is "seven hundred twenty-two", and thus it is an aban number and an iban number.

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