72172789440 has 112 divisors (see below), whose sum is σ = 231909689088. Its totient is φ = 19014175744.

The previous prime is 72172789421. The next prime is 72172789453. The reversal of 72172789440 is 4498727127.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373212 + ... + 532571.

It is an arithmetic number, because the mean of its divisors is an integer number (2070622224).

Almost surely, 2^72172789440 is an apocalyptic number.

It is an amenable number.

72172789440 is an abundant number, since it is smaller than the sum of its proper divisors (159736899648).

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

72172789440 is a wasteful number, since it uses less digits than its factorization.

72172789440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905886 (or 905876 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 72172789440 in words is "seventy-two billion, one hundred seventy-two million, seven hundred eighty-nine thousand, four hundred forty".