641005056 has 160 divisors (see below), whose sum is σ = 1922421600. Its totient is φ = 210862080.

The previous prime is 641005051. The next prime is 641005061. The reversal of 641005056 is 650500146.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (641005051) and next prime (641005061).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641005051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1230076 + ... + 1230596.

It is an arithmetic number, because the mean of its divisors is an integer number (12015135).

Almost surely, 2^641005056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641005056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (961210800).

641005056 is an abundant number, since it is smaller than the sum of its proper divisors (1281416544).

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

641005056 is an equidigital number, since it uses as much as digits as its factorization.

641005056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 641005056 is about 25318.0776521441. The cubic root of 641005056 is about 862.2247499759.

The spelling of 641005056 in words is "six hundred forty-one million, five thousand, fifty-six".