172897664 has 32 divisors (see below), whose sum is σ = 355563840. Its totient is φ = 83658240.

The previous prime is 172897661. The next prime is 172897691. The reversal of 172897664 is 466798271.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172897661) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17819 + ... + 25754.

It is an arithmetic number, because the mean of its divisors is an integer number (11111370).

Almost surely, 2^172897664 is an apocalyptic number.

It is an amenable number.

172897664 is an abundant number, since it is smaller than the sum of its proper divisors (182666176).

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

172897664 is an equidigital number, since it uses as much as digits as its factorization.

172897664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43618 (or 43606 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 50.

The square root of 172897664 is about 13149.0556314893. The cubic root of 172897664 is about 557.0955745604.

The spelling of 172897664 in words is "one hundred seventy-two million, eight hundred ninety-seven thousand, six hundred sixty-four".