660830988 has 12 divisors (see below), whose sum is σ = 1541939000. Its totient is φ = 220276992.

The previous prime is 660830969. The next prime is 660831013. The reversal of 660830988 is 889038066.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×660830988² = 873395189402112288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27534613 + ... + 27534636.

Almost surely, 2^660830988 is an apocalyptic number.

It is an amenable number.

660830988 is an abundant number, since it is smaller than the sum of its proper divisors (881108012).

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

660830988 is a wasteful number, since it uses less digits than its factorization.

660830988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55069256 (or 55069254 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 660830988 is about 25706.6331517762. The cubic root of 660830988 is about 871.0240234366.

The spelling of 660830988 in words is "six hundred sixty million, eight hundred thirty thousand, nine hundred eighty-eight".