72638725 has 6 divisors (see below), whose sum is σ = 90072050. Its totient is φ = 58110960.

The previous prime is 72638717. The next prime is 72638747. The reversal of 72638725 is 52783627.

It can be written as a sum of positive squares in 3 ways, for example, as 8862529 + 63776196 = 2977^2 + 7986^2 .

It is not a de Polignac number, because 72638725 - 2³ = 72638717 is a prime.

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, 1452750 + ... + 1452799.

Almost surely, 2^72638725 is an apocalyptic number.

It is an amenable number.

72638725 is a deficient number, since it is larger than the sum of its proper divisors (17433325).

72638725 is a wasteful number, since it uses less digits than its factorization.

72638725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905559 (or 2905554 counting only the distinct ones).

The product of its digits is 141120, while the sum is 40.

The square root of 72638725 is about 8522.8355023431. The cubic root of 72638725 is about 417.2433313085.

The spelling of 72638725 in words is "seventy-two million, six hundred thirty-eight thousand, seven hundred twenty-five".