172128493100 has 72 divisors (see below), whose sum is σ = 376745886720. Its totient is φ = 68259123520.

The previous prime is 172128493067. The next prime is 172128493123. The reversal of 172128493100 is 1394821271.

It is a happy number.

172128493100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×172128493100² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5409437 + ... + 5441163.

It is an arithmetic number, because the mean of its divisors is an integer number (5232581760).

Almost surely, 2^172128493100 is an apocalyptic number.

172128493100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172128493100 is an abundant number, since it is smaller than the sum of its proper divisors (204617393620).

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

172128493100 is a wasteful number, since it uses less digits than its factorization.

172128493100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32207 (or 32200 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 172128493100 in words is "one hundred seventy-two billion, one hundred twenty-eight million, four hundred ninety-three thousand, one hundred".