68690664 has 96 divisors (see below), whose sum is σ = 215641920. Its totient is φ = 19346688.

The previous prime is 68690663. The next prime is 68690669. The reversal of 68690664 is 46609686.

It is not an unprimeable number, because it can be changed into a prime (68690663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35859 + ... + 37725.

It is an arithmetic number, because the mean of its divisors is an integer number (2246270).

Almost surely, 2^68690664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68690664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107820960).

68690664 is an abundant number, since it is smaller than the sum of its proper divisors (146951256).

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

68690664 is a wasteful number, since it uses less digits than its factorization.

68690664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 68690664 is about 8287.9831080909. The cubic root of 68690664 is about 409.5427462343.

The spelling of 68690664 in words is "sixty-eight million, six hundred ninety thousand, six hundred sixty-four".