172239890888 has 36 divisors (see below), whose sum is σ = 349734018465. Its totient is φ = 79488291168.

The previous prime is 172239890843. The next prime is 172239890891. The reversal of 172239890888 is 888098932271.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 147270202564 + 24969688324 = 383758^2 + 158018^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=293462.

It is a super-2 number, since 2×172239890888² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15254381 + ... + 15265667.

Almost surely, 2^172239890888 is an apocalyptic number.

It is an amenable number.

172239890888 is an abundant number, since it is smaller than the sum of its proper divisors (177494127577).

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

172239890888 is an frugal number, since it uses more digits than its factorization.

172239890888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22606 (or 11302 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 65.

The spelling of 172239890888 in words is "one hundred seventy-two billion, two hundred thirty-nine million, eight hundred ninety thousand, eight hundred eighty-eight".