172972868 has 6 divisors (see below), whose sum is σ = 302702526. Its totient is φ = 86486432.

The previous prime is 172972859. The next prime is 172972871. The reversal of 172972868 is 868279271.

172972868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 146119744 + 26853124 = 12088^2 + 5182^2 .

It is a super-2 number, since 2×172972868² = 59839226128290848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21621605 + ... + 21621612.

It is an arithmetic number, because the mean of its divisors is an integer number (50450421).

Almost surely, 2^172972868 is an apocalyptic number.

It is an amenable number.

172972868 is a deficient number, since it is larger than the sum of its proper divisors (129729658).

172972868 is a wasteful number, since it uses less digits than its factorization.

172972868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43243221 (or 43243219 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The square root of 172972868 is about 13151.9149936426. The cubic root of 172972868 is about 557.1763347468.

The spelling of 172972868 in words is "one hundred seventy-two million, nine hundred seventy-two thousand, eight hundred sixty-eight".