72257585 has 4 divisors (see below), whose sum is σ = 86709108. Its totient is φ = 57806064.

The previous prime is 72257579. The next prime is 72257593. The reversal of 72257585 is 58575227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58575227 = 23 ⋅2546749.

It can be written as a sum of positive squares in 2 ways, for example, as 43784689 + 28472896 = 6617^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 72257585 - 2²⁰ = 71209009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7225754 + ... + 7225763.

It is an arithmetic number, because the mean of its divisors is an integer number (21677277).

Almost surely, 2^72257585 is an apocalyptic number.

It is an amenable number.

72257585 is a deficient number, since it is larger than the sum of its proper divisors (14451523).

72257585 is a wasteful number, since it uses less digits than its factorization.

72257585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14451522.

The product of its digits is 196000, while the sum is 41.

The square root of 72257585 is about 8500.4461647610. The cubic root of 72257585 is about 416.5122837831.

The spelling of 72257585 in words is "seventy-two million, two hundred fifty-seven thousand, five hundred eighty-five".