72157208 has 8 divisors (see below), whose sum is σ = 135294780. Its totient is φ = 36078600.

The previous prime is 72157199. The next prime is 72157271. The reversal of 72157208 is 80275127.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4509818 + ... + 4509833.

Almost surely, 2^72157208 is an apocalyptic number.

It is an amenable number.

72157208 is a deficient number, since it is larger than the sum of its proper divisors (63137572).

72157208 is a wasteful number, since it uses less digits than its factorization.

72157208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9019657 (or 9019653 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 72157208 is about 8494.5398933668. The cubic root of 72157208 is about 416.3193276717.

The spelling of 72157208 in words is "seventy-two million, one hundred fifty-seven thousand, two hundred eight".