668924240 has 40 divisors (see below), whose sum is σ = 1567518720. Its totient is φ = 265458816.

The previous prime is 668924219. The next prime is 668924251. The reversal of 668924240 is 42429866.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22760 + ... + 43079.

It is an arithmetic number, because the mean of its divisors is an integer number (39187968).

Almost surely, 2^668924240 is an apocalyptic number.

It is an amenable number.

668924240 is an abundant number, since it is smaller than the sum of its proper divisors (898594480).

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

668924240 is a wasteful number, since it uses less digits than its factorization.

668924240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65979 (or 65973 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 668924240 is about 25863.5697458800. The cubic root of 668924240 is about 874.5654397258.

The spelling of 668924240 in words is "six hundred sixty-eight million, nine hundred twenty-four thousand, two hundred forty".