668813076 has 36 divisors (see below), whose sum is σ = 1691481792. Its totient is φ = 222822864.

The previous prime is 668813069. The next prime is 668813077. The reversal of 668813076 is 670318866.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668813077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94021 + ... + 100883.

Almost surely, 2^668813076 is an apocalyptic number.

It is an amenable number.

668813076 is an abundant number, since it is smaller than the sum of its proper divisors (1022668716).

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

668813076 is a wasteful number, since it uses less digits than its factorization.

668813076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9580 (or 9575 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 668813076 is about 25861.4206106316. The cubic root of 668813076 is about 874.5169910014.

The spelling of 668813076 in words is "six hundred sixty-eight million, eight hundred thirteen thousand, seventy-six".