172157880 has 64 divisors (see below), whose sum is σ = 533145600. Its totient is φ = 44426880.

The previous prime is 172157809. The next prime is 172157897. The reversal of 172157880 is 88751271.

172157880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19420 + ... + 26859.

It is an arithmetic number, because the mean of its divisors is an integer number (8330400).

Almost surely, 2^172157880 is an apocalyptic number.

172157880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172157880 is an abundant number, since it is smaller than the sum of its proper divisors (360987720).

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

172157880 is a wasteful number, since it uses less digits than its factorization.

172157880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46324 (or 46320 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 39.

The square root of 172157880 is about 13120.8947865609. The cubic root of 172157880 is about 556.2998830828.

The spelling of 172157880 in words is "one hundred seventy-two million, one hundred fifty-seven thousand, eight hundred eighty".