68439680 has 32 divisors (see below), whose sum is σ = 163615140. Its totient is φ = 27375616.

The previous prime is 68439673. The next prime is 68439719. The reversal of 68439680 is 8693486.

It can be written as a sum of positive squares in 2 ways, for example, as 67502656 + 937024 = 8216^2 + 968^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 52829 + ... + 54108.

Almost surely, 2^68439680 is an apocalyptic number.

It is an amenable number.

68439680 is an abundant number, since it is smaller than the sum of its proper divisors (95175460).

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

68439680 is a wasteful number, since it uses less digits than its factorization.

68439680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106956 (or 106944 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 68439680 is about 8272.8278115769. The cubic root of 68439680 is about 409.0433376483.

The spelling of 68439680 in words is "sixty-eight million, four hundred thirty-nine thousand, six hundred eighty".