66684988 has 12 divisors (see below), whose sum is σ = 117113080. Its totient is φ = 33224112.

The previous prime is 66684979. The next prime is 66684997. The reversal of 66684988 is 88948666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66684979) and next prime (66684997).

It is a congruent number.

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, 28323 + ... + 30586.

Almost surely, 2^66684988 is an apocalyptic number.

It is an amenable number.

66684988 is a deficient number, since it is larger than the sum of its proper divisors (50428092).

66684988 is a wasteful number, since it uses less digits than its factorization.

66684988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59196 (or 59194 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 55.

The square root of 66684988 is about 8166.0876801563. The cubic root of 66684988 is about 405.5172743194.

The spelling of 66684988 in words is "sixty-six million, six hundred eighty-four thousand, nine hundred eighty-eight".