641473640 has 32 divisors (see below), whose sum is σ = 1463650560. Its totient is φ = 252974400.

The previous prime is 641473619. The next prime is 641473727. The reversal of 641473640 is 46374146.

It is a super-2 number, since 2×641473640² = 822976861629699200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641473640.

It is an unprimeable number.

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, 110096 + ... + 115775.

It is an arithmetic number, because the mean of its divisors is an integer number (45739080).

Almost surely, 2^641473640 is an apocalyptic number.

It is an amenable number.

641473640 is an abundant number, since it is smaller than the sum of its proper divisors (822176920).

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

641473640 is a wasteful number, since it uses less digits than its factorization.

641473640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225953 (or 225949 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 641473640 is about 25327.3299026960. The cubic root of 641473640 is about 862.4347984038.

The spelling of 641473640 in words is "six hundred forty-one million, four hundred seventy-three thousand, six hundred forty".