68172920 has 32 divisors (see below), whose sum is σ = 160060320. Its totient is φ = 26083200.

The previous prime is 68172917. The next prime is 68172953. The reversal of 68172920 is 2927186.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36131 + ... + 37970.

It is an arithmetic number, because the mean of its divisors is an integer number (5001885).

Almost surely, 2^68172920 is an apocalyptic number.

It is an amenable number.

68172920 is an abundant number, since it is smaller than the sum of its proper divisors (91887400).

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

68172920 is a wasteful number, since it uses less digits than its factorization.

68172920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74135 (or 74131 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 68172920 is about 8256.6894092003. The cubic root of 68172920 is about 408.5111976304.

The spelling of 68172920 in words is "sixty-eight million, one hundred seventy-two thousand, nine hundred twenty".