666880764 has 48 divisors (see below), whose sum is σ = 1717994880. Its totient is φ = 199647040.

The previous prime is 666880751. The next prime is 666880793. The reversal of 666880764 is 467088666.

It is a congruent number.

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, 19479 + ... + 41390.

It is an arithmetic number, because the mean of its divisors is an integer number (35791560).

Almost surely, 2^666880764 is an apocalyptic number.

It is an amenable number.

666880764 is an abundant number, since it is smaller than the sum of its proper divisors (1051114116).

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

666880764 is a wasteful number, since it uses less digits than its factorization.

666880764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60970 (or 60968 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The square root of 666880764 is about 25824.0346189359. The cubic root of 666880764 is about 873.6739703513.

The spelling of 666880764 in words is "six hundred sixty-six million, eight hundred eighty thousand, seven hundred sixty-four".