66364640 has 24 divisors (see below), whose sum is σ = 156786840. Its totient is φ = 26545792.

The previous prime is 66364621. The next prime is 66364657. The reversal of 66364640 is 4646366.

66364640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66364640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207230 + ... + 207549.

It is an arithmetic number, because the mean of its divisors is an integer number (6532785).

Almost surely, 2^66364640 is an apocalyptic number.

It is an amenable number.

66364640 is an abundant number, since it is smaller than the sum of its proper divisors (90422200).

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

66364640 is a wasteful number, since it uses less digits than its factorization.

66364640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414794 (or 414786 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 66364640 is about 8146.4495333857. The cubic root of 66364640 is about 404.8668769404.

The spelling of 66364640 in words is "sixty-six million, three hundred sixty-four thousand, six hundred forty".