641645056 has 40 divisors (see below), whose sum is σ = 1380669444. Its totient is φ = 296140800.

The previous prime is 641644931. The next prime is 641645057. The reversal of 641645056 is 650546146.

It can be written as a sum of positive squares in 2 ways, for example, as 456249600 + 185395456 = 21360^2 + 13616^2 .

It is not an unprimeable number, because it can be changed into a prime (641645057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41545 + ... + 54856.

Almost surely, 2^641645056 is an apocalyptic number.

It is an amenable number.

641645056 is an abundant number, since it is smaller than the sum of its proper divisors (739024388).

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

641645056 is an equidigital number, since it uses as much as digits as its factorization.

641645056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96432 (or 96416 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 641645056 is about 25330.7136891166. The cubic root of 641645056 is about 862.5116121380.

The spelling of 641645056 in words is "six hundred forty-one million, six hundred forty-five thousand, fifty-six".