66305988 has 36 divisors (see below), whose sum is σ = 191551360. Its totient is φ = 18944496.

The previous prime is 66305983. The next prime is 66306007. The reversal of 66305988 is 88950366.

66305988 is a `hidden beast` number, since 6 + 630 + 5 + 9 + 8 + 8 = 666.

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

It is a super-2 number, since 2×66305988² = 8792968089312288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66305983) 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, 131308 + ... + 131811.

Almost surely, 2^66305988 is an apocalyptic number.

It is an amenable number.

66305988 is an abundant number, since it is smaller than the sum of its proper divisors (125245372).

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

66305988 is a wasteful number, since it uses less digits than its factorization.

66305988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263136 (or 263131 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 66305988 is about 8142.8488872139. The cubic root of 66305988 is about 404.7475701779.

The spelling of 66305988 in words is "sixty-six million, three hundred five thousand, nine hundred eighty-eight".