72156004 has 6 divisors (see below), whose sum is σ = 126273014. Its totient is φ = 36078000.

The previous prime is 72155971. The next prime is 72156011. The reversal of 72156004 is 40065127.

It can be written as a sum of positive squares in only one way, i.e., 50552100 + 21603904 = 7110^2 + 4648^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72156004.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019497 + ... + 9019504.

Almost surely, 2^72156004 is an apocalyptic number.

It is an amenable number.

72156004 is a deficient number, since it is larger than the sum of its proper divisors (54117010).

72156004 is a wasteful number, since it uses less digits than its factorization.

72156004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18039005 (or 18039003 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 72156004 is about 8494.4690240179. The cubic root of 72156004 is about 416.3170121199.

The spelling of 72156004 in words is "seventy-two million, one hundred fifty-six thousand, four".