722539631 has 8 divisors (see below), whose sum is σ = 788420304. Its totient is φ = 656691520.

The previous prime is 722539613. The next prime is 722539633. The reversal of 722539631 is 136935227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 722539631 - 2⁶ = 722539567 is a prime.

It is a super-2 number, since 2×722539631² = 1044127036731232322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722539633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77345 + ... + 86181.

It is an arithmetic number, because the mean of its divisors is an integer number (98552538).

Almost surely, 2^722539631 is an apocalyptic number.

722539631 is a deficient number, since it is larger than the sum of its proper divisors (65880673).

722539631 is a wasteful number, since it uses less digits than its factorization.

722539631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16281.

The product of its digits is 68040, while the sum is 38.

The square root of 722539631 is about 26880.0973026513. The cubic root of 722539631 is about 897.3335196054. Note that the first 3 decimals are identical.

The spelling of 722539631 in words is "seven hundred twenty-two million, five hundred thirty-nine thousand, six hundred thirty-one".