72172408 has 32 divisors (see below), whose sum is σ = 168716160. Its totient is φ = 28118880.

The previous prime is 72172391. The next prime is 72172411. The reversal of 72172408 is 80427127.

It is a self number, because there is not a number n which added to its sum of digits gives 72172408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57966 + ... + 59197.

It is an arithmetic number, because the mean of its divisors is an integer number (5272380).

Almost surely, 2^72172408 is an apocalyptic number.

It is an amenable number.

72172408 is an abundant number, since it is smaller than the sum of its proper divisors (96543752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72172408 is a wasteful number, since it uses less digits than its factorization.

72172408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117187 (or 117183 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 72172408 is about 8495.4345386213. The cubic root of 72172408 is about 416.3485583366.

The spelling of 72172408 in words is "seventy-two million, one hundred seventy-two thousand, four hundred eight".