72645688 has 16 divisors (see below), whose sum is σ = 138244680. Its totient is φ = 35780448.

The previous prime is 72645673. The next prime is 72645701. The reversal of 72645688 is 88654627.

It is a congruent 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, 67231 + ... + 68302.

Almost surely, 2^72645688 is an apocalyptic number.

It is an amenable number.

72645688 is a deficient number, since it is larger than the sum of its proper divisors (65598992).

72645688 is a wasteful number, since it uses less digits than its factorization.

72645688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135606 (or 135602 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 72645688 is about 8523.2439833669. The cubic root of 72645688 is about 417.2566629141.

The spelling of 72645688 in words is "seventy-two million, six hundred forty-five thousand, six hundred eighty-eight".