68988964864 has 52 divisors (see below), whose sum is σ = 138500013564. Its totient is φ = 34359738368.

The previous prime is 68988964843. The next prime is 68988964871. The reversal of 68988964864 is 46846988986.

It can be written as a sum of positive squares in 2 ways, for example, as 68685926400 + 303038464 = 262080^2 + 17408^2 .

It is an unprimeable number.

In principle, a polygon with 68988964864 sides can be constructed with ruler and compass.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1019904 + ... + 1085440.

Almost surely, 2^68988964864 is an apocalyptic number.

68988964864 is a gapful number since it is divisible by the number (64) 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 68988964864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69250006782).

68988964864 is an abundant number, since it is smaller than the sum of its proper divisors (69511048700).

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

68988964864 is an equidigital number, since it uses as much as digits as its factorization.

68988964864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65818 (or 65796 counting only the distinct ones).

The product of its digits is 1146617856, while the sum is 76.

The spelling of 68988964864 in words is "sixty-eight billion, nine hundred eighty-eight million, nine hundred sixty-four thousand, eight hundred sixty-four".