172172692920 has 128 divisors (see below), whose sum is σ = 551151763200. Its totient is φ = 42900378624.

The previous prime is 172172692907. The next prime is 172172692963. The reversal of 172172692920 is 29296271271.

It is a self number, because there is not a number n which added to its sum of digits gives 172172692920.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 350782 + ... + 683661.

It is an arithmetic number, because the mean of its divisors is an integer number (4305873150).

Almost surely, 2^172172692920 is an apocalyptic number.

172172692920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172172692920 is an abundant number, since it is smaller than the sum of its proper divisors (378979070280).

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

172172692920 is a wasteful number, since it uses less digits than its factorization.

172172692920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034549 (or 1034545 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 172172692920 in words is "one hundred seventy-two billion, one hundred seventy-two million, six hundred ninety-two thousand, nine hundred twenty".