172688168 has 8 divisors (see below), whose sum is σ = 323790330. Its totient is φ = 86344080.

The previous prime is 172688147. The next prime is 172688177. The reversal of 172688168 is 861886271.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 106461124 + 66227044 = 10318^2 + 8138^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10793003 + ... + 10793018.

Almost surely, 2^172688168 is an apocalyptic number.

It is an amenable number.

172688168 is a deficient number, since it is larger than the sum of its proper divisors (151102162).

172688168 is a wasteful number, since it uses less digits than its factorization.

172688168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21586027 (or 21586023 counting only the distinct ones).

The product of its digits is 258048, while the sum is 47.

The square root of 172688168 is about 13141.0870174427. The cubic root of 172688168 is about 556.8704771213.

The spelling of 172688168 in words is "one hundred seventy-two million, six hundred eighty-eight thousand, one hundred sixty-eight".