172157100 has 72 divisors (see below), whose sum is σ = 524341440. Its totient is φ = 43490880.

The previous prime is 172157087. The next prime is 172157101. The reversal of 172157100 is 1751271.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (172157101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9402 + ... + 20801.

It is an arithmetic number, because the mean of its divisors is an integer number (7282520).

Almost surely, 2^172157100 is an apocalyptic number.

172157100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172157100 is an abundant number, since it is smaller than the sum of its proper divisors (352184340).

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

172157100 is a wasteful number, since it uses less digits than its factorization.

172157100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30239 (or 30232 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 24.

The square root of 172157100 is about 13120.8650629446. The cubic root of 172157100 is about 556.2990429342.

The spelling of 172157100 in words is "one hundred seventy-two million, one hundred fifty-seven thousand, one hundred".