72173904 has 40 divisors (see below), whose sum is σ = 203400672. Its totient is φ = 21870720.

The previous prime is 72173903. The next prime is 72173911. The reversal of 72173904 is 40937127.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72173903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67819 + ... + 68874.

Almost surely, 2^72173904 is an apocalyptic number.

It is an amenable number.

72173904 is an abundant number, since it is smaller than the sum of its proper divisors (131226768).

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

72173904 is a wasteful number, since it uses less digits than its factorization.

72173904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136715 (or 136709 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 72173904 is about 8495.5225854564. The cubic root of 72173904 is about 416.3514350276.

The spelling of 72173904 in words is "seventy-two million, one hundred seventy-three thousand, nine hundred four".