6621688880 has 40 divisors (see below), whose sum is σ = 15400874400. Its totient is φ = 2647738368.

The previous prime is 6621688873. The next prime is 6621688903. The reversal of 6621688880 is 888861266.

It is a tau number, because it is divible by the number of its divisors (40).

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, 240461 + ... + 266579.

It is an arithmetic number, because the mean of its divisors is an integer number (385021860).

Almost surely, 2^6621688880 is an apocalyptic number.

It is an amenable number.

6621688880 is an abundant number, since it is smaller than the sum of its proper divisors (8779185520).

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

6621688880 is a wasteful number, since it uses less digits than its factorization.

6621688880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29301 (or 29295 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 53.

The square root of 6621688880 is about 81373.7603899439. The cubic root of 6621688880 is about 1877.8299315629.

The spelling of 6621688880 in words is "six billion, six hundred twenty-one million, six hundred eighty-eight thousand, eight hundred eighty".