172305664 has 18 divisors (see below), whose sum is σ = 343938770. Its totient is φ = 86152704.

The previous prime is 172305649. The next prime is 172305671. The reversal of 172305664 is 466503271.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 169208064 + 3097600 = 13008^2 + 1760^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336279 + ... + 336790.

Almost surely, 2^172305664 is an apocalyptic number.

It is an amenable number.

172305664 is a deficient number, since it is larger than the sum of its proper divisors (171633106).

172305664 is an frugal number, since it uses more digits than its factorization.

172305664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673085 (or 673071 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 172305664 is about 13126.5252066188. The cubic root of 172305664 is about 556.4590174558.

The spelling of 172305664 in words is "one hundred seventy-two million, three hundred five thousand, six hundred sixty-four".