172204656 has 40 divisors (see below), whose sum is σ = 479083920. Its totient is φ = 52985856.

The previous prime is 172204621. The next prime is 172204687. The reversal of 172204656 is 656402271.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137361 + ... + 138608.

It is an arithmetic number, because the mean of its divisors is an integer number (11977098).

Almost surely, 2^172204656 is an apocalyptic number.

172204656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172204656 is an abundant number, since it is smaller than the sum of its proper divisors (306879264).

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

172204656 is a wasteful number, since it uses less digits than its factorization.

172204656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275993 (or 275987 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 172204656 is about 13122.6771658835. The cubic root of 172204656 is about 556.3502615047.

The spelling of 172204656 in words is "one hundred seventy-two million, two hundred four thousand, six hundred fifty-six".