68172520 has 32 divisors (see below), whose sum is σ = 165188520. Its totient is φ = 25171200.

The previous prime is 68172509. The next prime is 68172521. The reversal of 68172520 is 2527186.

It can be written as a sum of positive squares in 4 ways, for example, as 40525956 + 27646564 = 6366^2 + 5258^2 .

It is not an unprimeable number, because it can be changed into a prime (68172521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65031 + ... + 66070.

Almost surely, 2^68172520 is an apocalyptic number.

It is an amenable number.

68172520 is an abundant number, since it is smaller than the sum of its proper divisors (97016000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68172520 is a wasteful number, since it uses less digits than its factorization.

68172520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131125 (or 131121 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 68172520 is about 8256.6651863812. The cubic root of 68172520 is about 408.5103986582.

The spelling of 68172520 in words is "sixty-eight million, one hundred seventy-two thousand, five hundred twenty".