72561858 has 32 divisors (see below), whose sum is σ = 149713920. Its totient is φ = 23434320.

The previous prime is 72561833. The next prime is 72561877. The reversal of 72561858 is 85816527.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23691 + ... + 26577.

It is an arithmetic number, because the mean of its divisors is an integer number (4678560).

Almost surely, 2^72561858 is an apocalyptic number.

72561858 is an abundant number, since it is smaller than the sum of its proper divisors (77152062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72561858 is a wasteful number, since it uses less digits than its factorization.

72561858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022.

The product of its digits is 134400, while the sum is 42.

The square root of 72561858 is about 8518.3248353183. The cubic root of 72561858 is about 417.0961023896.

The spelling of 72561858 in words is "seventy-two million, five hundred sixty-one thousand, eight hundred fifty-eight".