72161885 has 16 divisors (see below), whose sum is σ = 88615296. Its totient is φ = 56392128.

The previous prime is 72161849. The next prime is 72161891. The reversal of 72161885 is 58816127.

It is a cyclic number.

It is not a de Polignac number, because 72161885 - 2⁸ = 72161629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80912 + ... + 81798.

It is an arithmetic number, because the mean of its divisors is an integer number (5538456).

Almost surely, 2^72161885 is an apocalyptic number.

It is an amenable number.

72161885 is a deficient number, since it is larger than the sum of its proper divisors (16453411).

72161885 is a wasteful number, since it uses less digits than its factorization.

72161885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its digits is 26880, while the sum is 38.

The square root of 72161885 is about 8494.8151833927. The cubic root of 72161885 is about 416.3283223076.

The spelling of 72161885 in words is "seventy-two million, one hundred sixty-one thousand, eight hundred eighty-five".