722457313 has 4 divisors (see below), whose sum is σ = 764954820. Its totient is φ = 679959808.

The previous prime is 722457299. The next prime is 722457331. The reversal of 722457313 is 313754227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250177489 + 472279824 = 15817^2 + 21732^2 .

It is a cyclic number.

It is not a de Polignac number, because 722457313 - 2¹³ = 722449121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722457013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21248728 + ... + 21248761.

It is an arithmetic number, because the mean of its divisors is an integer number (191238705).

Almost surely, 2^722457313 is an apocalyptic number.

It is an amenable number.

722457313 is a deficient number, since it is larger than the sum of its proper divisors (42497507).

722457313 is a wasteful number, since it uses less digits than its factorization.

722457313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42497506.

The product of its digits is 35280, while the sum is 34.

The square root of 722457313 is about 26878.5660517819. The cubic root of 722457313 is about 897.2994409645.

The spelling of 722457313 in words is "seven hundred twenty-two million, four hundred fifty-seven thousand, three hundred thirteen".