68931840 has 144 divisors (see below), whose sum is σ = 228110400. Its totient is φ = 17719296.

The previous prime is 68931839. The next prime is 68931893. The reversal of 68931840 is 4813986.

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, 111051 + ... + 111669.

It is an arithmetic number, because the mean of its divisors is an integer number (1584100).

Almost surely, 2^68931840 is an apocalyptic number.

68931840 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 68931840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114055200).

68931840 is an abundant number, since it is smaller than the sum of its proper divisors (159178560).

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

68931840 is a wasteful number, since it uses less digits than its factorization.

68931840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 68931840 is about 8302.5200993433. The cubic root of 68931840 is about 410.0214940149.

The spelling of 68931840 in words is "sixty-eight million, nine hundred thirty-one thousand, eight hundred forty".