172809320 has 32 divisors (see below), whose sum is σ = 393513120. Its totient is φ = 68289600.

The previous prime is 172809319. The next prime is 172809337. The reversal of 172809320 is 23908271.

It is a super-2 number, since 2×172809320² = 59726122157724800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22706 + ... + 29345.

It is an arithmetic number, because the mean of its divisors is an integer number (12297285).

Almost surely, 2^172809320 is an apocalyptic number.

172809320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172809320 is an abundant number, since it is smaller than the sum of its proper divisors (220703800).

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

172809320 is a wasteful number, since it uses less digits than its factorization.

172809320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52145 (or 52141 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 172809320 is about 13145.6958735550. The cubic root of 172809320 is about 557.0006736516. Note that the first 3 decimals are identical.

The spelling of 172809320 in words is "one hundred seventy-two million, eight hundred nine thousand, three hundred twenty".