66986864 has 40 divisors (see below), whose sum is σ = 148942848. Its totient is φ = 28589760.

The previous prime is 66986863. The next prime is 66986869. The reversal of 66986864 is 46868966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66986861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29249 + ... + 31455.

Almost surely, 2^66986864 is an apocalyptic number.

It is an amenable number.

66986864 is an abundant number, since it is smaller than the sum of its proper divisors (81955984).

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

66986864 is a wasteful number, since it uses less digits than its factorization.

66986864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493 (or 2487 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 53.

The square root of 66986864 is about 8184.5503236280. The cubic root of 66986864 is about 406.1282647794.

The spelling of 66986864 in words is "sixty-six million, nine hundred eighty-six thousand, eight hundred sixty-four".