6821400680 has 32 divisors (see below), whose sum is σ = 15380236800. Its totient is φ = 2722856256.

The previous prime is 6821400661. The next prime is 6821400709. The reversal of 6821400680 is 860041286.

It is a self number, because there is not a number n which added to its sum of digits gives 6821400680.

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, 158852 + ... + 197171.

It is an arithmetic number, because the mean of its divisors is an integer number (480632400).

Almost surely, 2^6821400680 is an apocalyptic number.

It is an amenable number.

6821400680 is an abundant number, since it is smaller than the sum of its proper divisors (8558836120).

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

6821400680 is a wasteful number, since it uses less digits than its factorization.

6821400680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356513 (or 356509 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 6821400680 is about 82591.7712608223. The cubic root of 6821400680 is about 1896.5218621099.

The spelling of 6821400680 in words is "six billion, eight hundred twenty-one million, four hundred thousand, six hundred eighty".