641656000 has 56 divisors (see below), whose sum is σ = 1589080896. Its totient is φ = 256659200.

The previous prime is 641655997. The next prime is 641656021. The reversal of 641656000 is 656146.

It is a self number, because there is not a number n which added to its sum of digits gives 641656000.

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, 32104 + ... + 48103.

Almost surely, 2^641656000 is an apocalyptic number.

It is an amenable number.

641656000 is an abundant number, since it is smaller than the sum of its proper divisors (947424896).

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

641656000 is an equidigital number, since it uses as much as digits as its factorization.

641656000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80234 (or 80214 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 641656000 is about 25330.9297105337. The cubic root of 641656000 is about 862.5165158218.

The spelling of 641656000 in words is "six hundred forty-one million, six hundred fifty-six thousand".