72256865 has 4 divisors (see below), whose sum is σ = 86708244. Its totient is φ = 57805488.

The previous prime is 72256859. The next prime is 72256889. The reversal of 72256865 is 56865227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56865227 = 79 ⋅719813.

It can be written as a sum of positive squares in 2 ways, for example, as 55249489 + 17007376 = 7433^2 + 4124^2 .

It is a cyclic number.

It is not a de Polignac number, because 72256865 - 2¹⁴ = 72240481 is a prime.

It is a Duffinian 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, 7225682 + ... + 7225691.

It is an arithmetic number, because the mean of its divisors is an integer number (21677061).

Almost surely, 2^72256865 is an apocalyptic number.

It is an amenable number.

72256865 is a deficient number, since it is larger than the sum of its proper divisors (14451379).

72256865 is a wasteful number, since it uses less digits than its factorization.

72256865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14451378.

The product of its digits is 201600, while the sum is 41.

The square root of 72256865 is about 8500.4038139373. The cubic root of 72256865 is about 416.5109003535.

The spelling of 72256865 in words is "seventy-two million, two hundred fifty-six thousand, eight hundred sixty-five".