6624637920 has 96 divisors (see below), whose sum is σ = 23186247840. Its totient is φ = 1766568960.

The previous prime is 6624637913. The next prime is 6624637937. The reversal of 6624637920 is 297364266.

6624637920 is a `hidden beast` number, since 6 + 6 + 2 + 4 + 637 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×6624637920² = 87771655142203852800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 762421 + ... + 771060.

It is an arithmetic number, because the mean of its divisors is an integer number (241523415).

Almost surely, 2^6624637920 is an apocalyptic number.

6624637920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6624637920 is an abundant number, since it is smaller than the sum of its proper divisors (16561609920).

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

6624637920 is a wasteful number, since it uses less digits than its factorization.

6624637920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533505 (or 1533491 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The square root of 6624637920 is about 81391.8787103480. The cubic root of 6624637920 is about 1878.1086607401.

The spelling of 6624637920 in words is "six billion, six hundred twenty-four million, six hundred thirty-seven thousand, nine hundred twenty".