66393964 has 48 divisors (see below), whose sum is σ = 143942400. Its totient is φ = 26093376.

The previous prime is 66393937. The next prime is 66393979. The reversal of 66393964 is 46939366.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64647 + ... + 65665.

It is an arithmetic number, because the mean of its divisors is an integer number (2998800).

Almost surely, 2^66393964 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66393964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71971200).

66393964 is an abundant number, since it is smaller than the sum of its proper divisors (77548436).

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

66393964 is a wasteful number, since it uses less digits than its factorization.

66393964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222 (or 1220 counting only the distinct ones).

The product of its digits is 629856, while the sum is 46.

The square root of 66393964 is about 8148.2491370846. The cubic root of 66393964 is about 404.9264998967.

The spelling of 66393964 in words is "sixty-six million, three hundred ninety-three thousand, nine hundred sixty-four".