72999128 has 16 divisors (see below), whose sum is σ = 137099760. Its totient is φ = 36439200.

The previous prime is 72999109. The next prime is 72999137. The reversal of 72999128 is 82199927.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2183 + ... + 12278.

It is an arithmetic number, because the mean of its divisors is an integer number (8568735).

Almost surely, 2^72999128 is an apocalyptic number.

It is an amenable number.

72999128 is a deficient number, since it is larger than the sum of its proper divisors (64100632).

72999128 is a wasteful number, since it uses less digits than its factorization.

72999128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15098 (or 15094 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 72999128 is about 8543.9527152250. The cubic root of 72999128 is about 417.9322555293.

The spelling of 72999128 in words is "seventy-two million, nine hundred ninety-nine thousand, one hundred twenty-eight".