172840872 has 64 divisors (see below), whose sum is σ = 469555200. Its totient is φ = 52816320.

The previous prime is 172840849. The next prime is 172840879. The reversal of 172840872 is 278048271.

172840872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 172840872.

It is not an unprimeable number, because it can be changed into a prime (172840879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8023 + ... + 20249.

It is an arithmetic number, because the mean of its divisors is an integer number (7336800).

Almost surely, 2^172840872 is an apocalyptic number.

172840872 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 172840872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234777600).

172840872 is an abundant number, since it is smaller than the sum of its proper divisors (296714328).

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

172840872 is a wasteful number, since it uses less digits than its factorization.

172840872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12286 (or 12282 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 172840872 is about 13146.8959073996. The cubic root of 172840872 is about 557.0345711593.

The spelling of 172840872 in words is "one hundred seventy-two million, eight hundred forty thousand, eight hundred seventy-two".