6403644460 has 24 divisors (see below), whose sum is σ = 13566663936. Its totient is φ = 2538789120.

The previous prime is 6403644451. The next prime is 6403644523. The reversal of 6403644460 is 644463046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414476 + ... + 1418995.

It is an arithmetic number, because the mean of its divisors is an integer number (565277664).

Almost surely, 2^6403644460 is an apocalyptic number.

It is an amenable number.

6403644460 is an abundant number, since it is smaller than the sum of its proper divisors (7163019476).

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

6403644460 is a wasteful number, since it uses less digits than its factorization.

6403644460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833593 (or 2833591 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 37.

The square root of 6403644460 is about 80022.7746332255. The cubic root of 6403644460 is about 1856.9878850059.

The spelling of 6403644460 in words is "six billion, four hundred three million, six hundred forty-four thousand, four hundred sixty".