641894080 has 28 divisors (see below), whose sum is σ = 1528511040. Its totient is φ = 256757504.

The previous prime is 641894053. The next prime is 641894083. The reversal of 641894080 is 80498146.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (641894083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1002640 + ... + 1003279.

It is an arithmetic number, because the mean of its divisors is an integer number (54589680).

Almost surely, 2^641894080 is an apocalyptic number.

It is an amenable number.

641894080 is an abundant number, since it is smaller than the sum of its proper divisors (886616960).

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

641894080 is a wasteful number, since it uses less digits than its factorization.

641894080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005936 (or 2005926 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 641894080 is about 25335.6286679451. The cubic root of 641894080 is about 862.6231786546.

The spelling of 641894080 in words is "six hundred forty-one million, eight hundred ninety-four thousand, eighty".