72557138 has 16 divisors (see below), whose sum is σ = 110972160. Its totient is φ = 35569776.

The previous prime is 72557129. The next prime is 72557141. The reversal of 72557138 is 83175527.

It is a happy number.

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, 71120 + ... + 72132.

It is an arithmetic number, because the mean of its divisors is an integer number (6935760).

Almost surely, 2^72557138 is an apocalyptic number.

72557138 is a deficient number, since it is larger than the sum of its proper divisors (38415022).

72557138 is a wasteful number, since it uses less digits than its factorization.

72557138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681.

The product of its digits is 58800, while the sum is 38.

The square root of 72557138 is about 8518.0477810353. The cubic root of 72557138 is about 417.0870584449.

The spelling of 72557138 in words is "seventy-two million, five hundred fifty-seven thousand, one hundred thirty-eight".