72530731 has 24 divisors (see below), whose sum is σ = 93819264. Its totient is φ = 55520640.

The previous prime is 72530719. The next prime is 72530743. The reversal of 72530731 is 13703527.

It is an interprime number because it is at equal distance from previous prime (72530719) and next prime (72530743).

It is not a de Polignac number, because 72530731 - 2⁷ = 72530603 is a prime.

It is a super-2 number, since 2×72530731² = 10521413878788722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72530731.

It is not an unprimeable number, because it can be changed into a prime (72530761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17911 + ... + 21583.

It is an arithmetic number, because the mean of its divisors is an integer number (3909136).

Almost surely, 2^72530731 is an apocalyptic number.

72530731 is a deficient number, since it is larger than the sum of its proper divisors (21288533).

72530731 is a wasteful number, since it uses less digits than its factorization.

72530731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3731 (or 3724 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 72530731 is about 8516.4975782301. The cubic root of 72530731 is about 417.0364530200.

The spelling of 72530731 in words is "seventy-two million, five hundred thirty thousand, seven hundred thirty-one".