172172816 has 10 divisors (see below), whose sum is σ = 333584862. Its totient is φ = 86086400.

The previous prime is 172172809. The next prime is 172172831. The reversal of 172172816 is 618271271.

It can be written as a sum of positive squares in only one way, i.e., 172134400 + 38416 = 13120^2 + 196^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5380385 + ... + 5380416.

Almost surely, 2^172172816 is an apocalyptic number.

172172816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172172816 is a deficient number, since it is larger than the sum of its proper divisors (161412046).

172172816 is a wasteful number, since it uses less digits than its factorization.

172172816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10760809 (or 10760803 counting only the distinct ones).

The product of its digits is 9408, while the sum is 35.

The square root of 172172816 is about 13121.4639427161. The cubic root of 172172816 is about 556.3159703603.

The spelling of 172172816 in words is "one hundred seventy-two million, one hundred seventy-two thousand, eight hundred sixteen".