72257865 has 16 divisors (see below), whose sum is σ = 115732608. Its totient is φ = 38497536.

The previous prime is 72257851. The next prime is 72257909. The reversal of 72257865 is 56875227.

It is not a de Polignac number, because 72257865 - 2⁵ = 72257833 is a prime.

It is a Curzon number.

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, 17697 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (7233288).

Almost surely, 2^72257865 is an apocalyptic number.

It is an amenable number.

72257865 is a deficient number, since it is larger than the sum of its proper divisors (43474743).

72257865 is a wasteful number, since it uses less digits than its factorization.

72257865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008.

The product of its digits is 235200, while the sum is 42.

The square root of 72257865 is about 8500.4626344688. The cubic root of 72257865 is about 416.5128217810.

The spelling of 72257865 in words is "seventy-two million, two hundred fifty-seven thousand, eight hundred sixty-five".