172664988 has 24 divisors (see below), whose sum is σ = 426584592. Its totient is φ = 54169344.

The previous prime is 172664959. The next prime is 172664993. The reversal of 172664988 is 889466271.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 172664988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422995 + ... + 423402.

It is an arithmetic number, because the mean of its divisors is an integer number (17774358).

Almost surely, 2^172664988 is an apocalyptic number.

It is an amenable number.

172664988 is an abundant number, since it is smaller than the sum of its proper divisors (253919604).

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

172664988 is a wasteful number, since it uses less digits than its factorization.

172664988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846421 (or 846419 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 172664988 is about 13140.2050212316. The cubic root of 172664988 is about 556.8455596927.

The spelling of 172664988 in words is "one hundred seventy-two million, six hundred sixty-four thousand, nine hundred eighty-eight".