72657988 has 24 divisors (see below), whose sum is σ = 137168640. Its totient is φ = 33476640.

The previous prime is 72657979. The next prime is 72658007. The reversal of 72657988 is 88975627.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49773 + ... + 51211.

It is an arithmetic number, because the mean of its divisors is an integer number (5715360).

Almost surely, 2^72657988 is an apocalyptic number.

It is an amenable number.

72657988 is a deficient number, since it is larger than the sum of its proper divisors (64510652).

72657988 is a wasteful number, since it uses less digits than its factorization.

72657988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427 (or 2425 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 52.

The square root of 72657988 is about 8523.9655090809. The cubic root of 72657988 is about 417.2802108468.

The spelling of 72657988 in words is "seventy-two million, six hundred fifty-seven thousand, nine hundred eighty-eight".