72640075 has 6 divisors (see below), whose sum is σ = 90073724. Its totient is φ = 58112040.

The previous prime is 72640019. The next prime is 72640091. The reversal of 72640075 is 57004627.

It is not a de Polignac number, because 72640075 - 2²⁵ = 39085643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1452777 + ... + 1452826.

Almost surely, 2^72640075 is an apocalyptic number.

72640075 is a deficient number, since it is larger than the sum of its proper divisors (17433649).

72640075 is a wasteful number, since it uses less digits than its factorization.

72640075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905613 (or 2905608 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 72640075 is about 8522.9147009694. The cubic root of 72640075 is about 417.2459161327.

The spelling of 72640075 in words is "seventy-two million, six hundred forty thousand, seventy-five".