68640960 has 112 divisors (see below), whose sum is σ = 220041216. Its totient is φ = 18127872.

The previous prime is 68640959. The next prime is 68640991. The reversal of 68640960 is 6904686.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121639 + ... + 122201.

Almost surely, 2^68640960 is an apocalyptic number.

68640960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68640960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110020608).

68640960 is an abundant number, since it is smaller than the sum of its proper divisors (151400256).

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

68640960 is a wasteful number, since it uses less digits than its factorization.

68640960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 68640960 is about 8284.9840072266. The cubic root of 68640960 is about 409.4439418105.

The spelling of 68640960 in words is "sixty-eight million, six hundred forty thousand, nine hundred sixty".