172207872 has 108 divisors (see below), whose sum is σ = 508906944. Its totient is φ = 55971840.

The previous prime is 172207817. The next prime is 172207897. The reversal of 172207872 is 278702271.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93553 + ... + 95375.

Almost surely, 2^172207872 is an apocalyptic number.

172207872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172207872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254453472).

172207872 is an abundant number, since it is smaller than the sum of its proper divisors (336699072).

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

172207872 is a wasteful number, since it uses less digits than its factorization.

172207872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886 (or 1869 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 172207872 is about 13122.7997012833. The cubic root of 172207872 is about 556.3537248476.

The spelling of 172207872 in words is "one hundred seventy-two million, two hundred seven thousand, eight hundred seventy-two".