72640525 has 6 divisors (see below), whose sum is σ = 90074282. Its totient is φ = 58112400.

The previous prime is 72640501. The next prime is 72640531. The reversal of 72640525 is 52504627.

It can be written as a sum of positive squares in 3 ways, for example, as 17197609 + 55442916 = 4147^2 + 7446^2 .

It is not a de Polignac number, because 72640525 - 2⁵ = 72640493 is a prime.

It is a Duffinian 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, 1452786 + ... + 1452835.

Almost surely, 2^72640525 is an apocalyptic number.

It is an amenable number.

72640525 is a deficient number, since it is larger than the sum of its proper divisors (17433757).

72640525 is a wasteful number, since it uses less digits than its factorization.

72640525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905631 (or 2905626 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 72640525 is about 8522.9411003479. The cubic root of 72640525 is about 417.2467777337.

The spelling of 72640525 in words is "seventy-two million, six hundred forty thousand, five hundred twenty-five".