172120086 has 64 divisors (see below), whose sum is σ = 402393600. Its totient is φ = 54429408.

The previous prime is 172120049. The next prime is 172120103. The reversal of 172120086 is 680021271.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172140 + ... + 173136.

It is an arithmetic number, because the mean of its divisors is an integer number (6287400).

Almost surely, 2^172120086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172120086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201196800).

172120086 is an abundant number, since it is smaller than the sum of its proper divisors (230273514).

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

172120086 is a wasteful number, since it uses less digits than its factorization.

172120086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1164 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 172120086 is about 13119.4544856103. The cubic root of 172120086 is about 556.2591717378.

The spelling of 172120086 in words is "one hundred seventy-two million, one hundred twenty thousand, eighty-six".