72157885 has 8 divisors (see below), whose sum is σ = 88057440. Its totient is φ = 56747664.

The previous prime is 72157873. The next prime is 72157901. The reversal of 72157885 is 58875127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72157885 - 2⁵ = 72157853 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 122007 + ... + 122596.

It is an arithmetic number, because the mean of its divisors is an integer number (11007180).

Almost surely, 2^72157885 is an apocalyptic number.

It is an amenable number.

72157885 is a deficient number, since it is larger than the sum of its proper divisors (15899555).

72157885 is a wasteful number, since it uses less digits than its factorization.

72157885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244667.

The product of its digits is 156800, while the sum is 43.

The square root of 72157885 is about 8494.5797424004. The cubic root of 72157885 is about 416.3206296775.

The spelling of 72157885 in words is "seventy-two million, one hundred fifty-seven thousand, eight hundred eighty-five".