722947731 has 16 divisors (see below), whose sum is σ = 1052313600. Its totient is φ = 437836320.

The previous prime is 722947727. The next prime is 722947741. The reversal of 722947731 is 137749227.

It is a happy number.

It is not a de Polignac number, because 722947731 - 2² = 722947727 is a prime.

It is a super-2 number, since 2×722947731² = 1045306843516096722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (722947721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44046 + ... + 58188.

It is an arithmetic number, because the mean of its divisors is an integer number (65769600).

Almost surely, 2^722947731 is an apocalyptic number.

722947731 is a deficient number, since it is larger than the sum of its proper divisors (329365869).

722947731 is a wasteful number, since it uses less digits than its factorization.

722947731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15706.

The product of its digits is 148176, while the sum is 42.

The square root of 722947731 is about 26887.6873494170. The cubic root of 722947731 is about 897.5024297801.

The spelling of 722947731 in words is "seven hundred twenty-two million, nine hundred forty-seven thousand, seven hundred thirty-one".