66388364 has 24 divisors (see below), whose sum is σ = 134023680. Its totient is φ = 28184976.

The previous prime is 66388363. The next prime is 66388381. The reversal of 66388364 is 46388366.

It is not an unprimeable number, because it can be changed into a prime (66388363) 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, 8084 + ... + 14075.

It is an arithmetic number, because the mean of its divisors is an integer number (5584320).

Almost surely, 2^66388364 is an apocalyptic number.

It is an amenable number.

66388364 is an abundant number, since it is smaller than the sum of its proper divisors (67635316).

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

66388364 is a wasteful number, since it uses less digits than its factorization.

66388364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22277 (or 22275 counting only the distinct ones).

The product of its digits is 497664, while the sum is 44.

The square root of 66388364 is about 8147.9054977338. The cubic root of 66388364 is about 404.9151150658.

The spelling of 66388364 in words is "sixty-six million, three hundred eighty-eight thousand, three hundred sixty-four".