72915725 has 6 divisors (see below), whose sum is σ = 90415530. Its totient is φ = 58332560.

The previous prime is 72915709. The next prime is 72915743. The reversal of 72915725 is 52751927.

It can be written as a sum of positive squares in 3 ways, for example, as 22306729 + 50608996 = 4723^2 + 7114^2 .

It is not a de Polignac number, because 72915725 - 2⁴ = 72915709 is a prime.

It is a Curzon number.

It is a congruent 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, 1458290 + ... + 1458339.

It is an arithmetic number, because the mean of its divisors is an integer number (15069255).

Almost surely, 2^72915725 is an apocalyptic number.

It is an amenable number.

72915725 is a deficient number, since it is larger than the sum of its proper divisors (17499805).

72915725 is a wasteful number, since it uses less digits than its factorization.

72915725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916639 (or 2916634 counting only the distinct ones).

The product of its digits is 44100, while the sum is 38.

The square root of 72915725 is about 8539.0704997675. The cubic root of 72915725 is about 417.7730294848.

The spelling of 72915725 in words is "seventy-two million, nine hundred fifteen thousand, seven hundred twenty-five".