6400320004 has 81 divisors (see below), whose sum is σ = 12955394781. Its totient is φ = 2764869120.

The previous prime is 6400320001. The next prime is 6400320029. The reversal of 6400320004 is 4000230046.

The square root of 6400320004 is 80002.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 6399680004 + 640000 = 79998^2 + 800^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6400320001) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 35360794 + ... + 35360974.

Almost surely, 2^6400320004 is an apocalyptic number.

6400320004 is the 80002-nd square number.

It is an amenable number.

6400320004 is an abundant number, since it is smaller than the sum of its proper divisors (6555074777).

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

6400320004 is a wasteful number, since it uses less digits than its factorization.

6400320004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The cubic root of 6400320004 is about 1856.6664772417. Note that the first 3 decimals are identical.

Multiplying 6400320004 by its product of nonzero digits (576), we get a square (3686584322304 = 1920048²).

The spelling of 6400320004 in words is "six billion, four hundred million, three hundred twenty thousand, four".