66380864 has 28 divisors (see below), whose sum is σ = 143701008. Its totient is φ = 30172800.

The previous prime is 66380819. The next prime is 66380893. The reversal of 66380864 is 46808366.

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, 46442 + ... + 47849.

Almost surely, 2^66380864 is an apocalyptic number.

66380864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66380864 is an abundant number, since it is smaller than the sum of its proper divisors (77320144).

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

66380864 is a wasteful number, since it uses less digits than its factorization.

66380864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94314 (or 94304 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 66380864 is about 8147.4452437559. The cubic root of 66380864 is about 404.8998665215.

The spelling of 66380864 in words is "sixty-six million, three hundred eighty thousand, eight hundred sixty-four".