668895920 has 80 divisors (see below), whose sum is σ = 1938947328. Its totient is φ = 208485120.

The previous prime is 668895863. The next prime is 668895937. The reversal of 668895920 is 29598866.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 48134 + ... + 60453.

Almost surely, 2^668895920 is an apocalyptic number.

It is an amenable number.

668895920 is an abundant number, since it is smaller than the sum of its proper divisors (1270051408).

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

668895920 is a wasteful number, since it uses less digits than its factorization.

668895920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108618 (or 108612 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 668895920 is about 25863.0222518560. The cubic root of 668895920 is about 874.5530974996.

The spelling of 668895920 in words is "six hundred sixty-eight million, eight hundred ninety-five thousand, nine hundred twenty".