641755996 has 24 divisors (see below), whose sum is σ = 1285121376. Its totient is φ = 274693440.

The previous prime is 641755973. The next prime is 641755997. The reversal of 641755996 is 699557146.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641755997) 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 7 ways as a sum of consecutive naturals, for example, 9030 + ... + 36946.

It is an arithmetic number, because the mean of its divisors is an integer number (53546724).

Almost surely, 2^641755996 is an apocalyptic number.

It is an amenable number.

641755996 is an abundant number, since it is smaller than the sum of its proper divisors (643365380).

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

641755996 is a wasteful number, since it uses less digits than its factorization.

641755996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28749 (or 28747 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 52.

The square root of 641755996 is about 25332.9034261768. The cubic root of 641755996 is about 862.5613184999.

The spelling of 641755996 in words is "six hundred forty-one million, seven hundred fifty-five thousand, nine hundred ninety-six".