666868788 has 48 divisors (see below), whose sum is σ = 1750286720. Its totient is φ = 222286680.

The previous prime is 666868771. The next prime is 666868823. The reversal of 666868788 is 887868666.

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, 29368 + ... + 46863.

Almost surely, 2^666868788 is an apocalyptic number.

It is an amenable number.

666868788 is an abundant number, since it is smaller than the sum of its proper divisors (1083417932).

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

666868788 is an equidigital number, since it uses as much as digits as its factorization.

666868788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76256 (or 76236 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The square root of 666868788 is about 25823.8027408823. The cubic root of 666868788 is about 873.6687404399.

The spelling of 666868788 in words is "six hundred sixty-six million, eight hundred sixty-eight thousand, seven hundred eighty-eight".