6624644220 has 72 divisors (see below), whose sum is σ = 20101745664. Its totient is φ = 1765957248.

The previous prime is 6624644209. The next prime is 6624644239. The reversal of 6624644220 is 224464266.

6624644220 is a `hidden beast` number, since 6 + 6 + 2 + 4 + 644 + 2 + 2 + 0 = 666.

It is a super-2 number, since 2×6624644220² = 87771822083158816800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 780037 + ... + 788483.

It is an arithmetic number, because the mean of its divisors is an integer number (279190912).

Almost surely, 2^6624644220 is an apocalyptic number.

6624644220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6624644220 is an abundant number, since it is smaller than the sum of its proper divisors (13477101444).

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

6624644220 is a wasteful number, since it uses less digits than its factorization.

6624644220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12819 (or 12814 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 6624644220 is about 81391.9174119888. The cubic root of 6624644220 is about 1878.1092560975.

The spelling of 6624644220 in words is "six billion, six hundred twenty-four million, six hundred forty-four thousand, two hundred twenty".