68139172 has 12 divisors (see below), whose sum is σ = 119302960. Its totient is φ = 34052616.

The previous prime is 68139151. The next prime is 68139191. The reversal of 68139172 is 27193186.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10423 + ... + 15649.

Almost surely, 2^68139172 is an apocalyptic number.

It is an amenable number.

68139172 is a deficient number, since it is larger than the sum of its proper divisors (51163788).

68139172 is a wasteful number, since it uses less digits than its factorization.

68139172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490 (or 8488 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 68139172 is about 8254.6454799707. The cubic root of 68139172 is about 408.4437773534.

The spelling of 68139172 in words is "sixty-eight million, one hundred thirty-nine thousand, one hundred seventy-two".