172128790 has 32 divisors (see below), whose sum is σ = 326826720. Its totient is φ = 65090304.

The previous prime is 172128769. The next prime is 172128793. The reversal of 172128790 is 97821271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172128793) 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, 166114 + ... + 167146.

It is an arithmetic number, because the mean of its divisors is an integer number (10213335).

Almost surely, 2^172128790 is an apocalyptic number.

172128790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172128790 is a deficient number, since it is larger than the sum of its proper divisors (154697930).

172128790 is a wasteful number, since it uses less digits than its factorization.

172128790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 172128790 is about 13119.7862025263. The cubic root of 172128790 is about 556.2685481338.

The spelling of 172128790 in words is "one hundred seventy-two million, one hundred twenty-eight thousand, seven hundred ninety".