6403644400 has 30 divisors (see below), whose sum is σ = 15384756632. Its totient is φ = 2561457600.

The previous prime is 6403644341. The next prime is 6403644413. The reversal of 6403644400 is 44463046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8004156 + ... + 8004955.

Almost surely, 2^6403644400 is an apocalyptic number.

It is an amenable number.

6403644400 is an abundant number, since it is smaller than the sum of its proper divisors (8981112232).

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

6403644400 is a wasteful number, since it uses less digits than its factorization.

6403644400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16009129 (or 16009118 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 6403644400 is about 80022.7742583322. The cubic root of 6403644400 is about 1856.9878792061.

The spelling of 6403644400 in words is "six billion, four hundred three million, six hundred forty-four thousand, four hundred".