72456172 has 6 divisors (see below), whose sum is σ = 126798308. Its totient is φ = 36228084.

The previous prime is 72456133. The next prime is 72456173. The reversal of 72456172 is 27165427.

It is not an unprimeable number, because it can be changed into a prime (72456173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9057018 + ... + 9057025.

Almost surely, 2^72456172 is an apocalyptic number.

It is an amenable number.

72456172 is a deficient number, since it is larger than the sum of its proper divisors (54342136).

72456172 is a wasteful number, since it uses less digits than its factorization.

72456172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18114047 (or 18114045 counting only the distinct ones).

The product of its digits is 23520, while the sum is 34.

The square root of 72456172 is about 8512.1191251063. The cubic root of 72456172 is about 416.8935045024.

The spelling of 72456172 in words is "seventy-two million, four hundred fifty-six thousand, one hundred seventy-two".