664218084 has 24 divisors (see below), whose sum is σ = 1641009888. Its totient is φ = 208382080.

The previous prime is 664217977. The next prime is 664218091. The reversal of 664218084 is 480812466.

It is a super-2 number, since 2×664218084² = 882371326225262112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1627782 + ... + 1628189.

It is an arithmetic number, because the mean of its divisors is an integer number (68375412).

Almost surely, 2^664218084 is an apocalyptic number.

It is an amenable number.

664218084 is an abundant number, since it is smaller than the sum of its proper divisors (976791804).

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

664218084 is a wasteful number, since it uses less digits than its factorization.

664218084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255995 (or 3255993 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 664218084 is about 25772.4287563280. The cubic root of 664218084 is about 872.5096356656.

The spelling of 664218084 in words is "six hundred sixty-four million, two hundred eighteen thousand, eighty-four".