666987000 has 64 divisors (see below), whose sum is σ = 2081008800. Its totient is φ = 177862400.

The previous prime is 666986987. The next prime is 666987019. The reversal of 666987000 is 789666.

It is a happy number.

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, 108165 + ... + 114164.

Almost surely, 2^666987000 is an apocalyptic number.

666987000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666987000 is an abundant number, since it is smaller than the sum of its proper divisors (1414021800).

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

666987000 is a wasteful number, since it uses less digits than its factorization.

666987000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222353 (or 222339 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 666987000 is about 25826.0914580585. The cubic root of 666987000 is about 873.7203608031.

The spelling of 666987000 in words is "six hundred sixty-six million, nine hundred eighty-seven thousand".