172918872 has 96 divisors (see below), whose sum is σ = 540583680. Its totient is φ = 48911040.

The previous prime is 172918859. The next prime is 172918897. The reversal of 172918872 is 278819271.

It is a nude number because it is divisible by every one of its digits.

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 23 ways as a sum of consecutive naturals, for example, 50247 + ... + 53577.

It is an arithmetic number, because the mean of its divisors is an integer number (5631080).

Almost surely, 2^172918872 is an apocalyptic number.

172918872 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 172918872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270291840).

172918872 is an abundant number, since it is smaller than the sum of its proper divisors (367664808).

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

172918872 is a wasteful number, since it uses less digits than its factorization.

172918872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453 (or 3446 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 172918872 is about 13149.8620525084. The cubic root of 172918872 is about 557.1183518103.

The spelling of 172918872 in words is "one hundred seventy-two million, nine hundred eighteen thousand, eight hundred seventy-two".