172961872 has 10 divisors (see below), whose sum is σ = 335113658. Its totient is φ = 86480928.

The previous prime is 172961869. The next prime is 172961897. The reversal of 172961872 is 278169271.

It can be written as a sum of positive squares in only one way, i.e., 172764736 + 197136 = 13144^2 + 444^2 .

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 as a sum of consecutive naturals, namely, 5405043 + ... + 5405074.

Almost surely, 2^172961872 is an apocalyptic number.

It is an amenable number.

172961872 is a deficient number, since it is larger than the sum of its proper divisors (162151786).

172961872 is a wasteful number, since it uses less digits than its factorization.

172961872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10810125 (or 10810119 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 172961872 is about 13151.4969490169. The cubic root of 172961872 is about 557.1645278068.

The spelling of 172961872 in words is "one hundred seventy-two million, nine hundred sixty-one thousand, eight hundred seventy-two".