6400040000 has 70 divisors (see below), whose sum is σ = 15870118374. Its totient is φ = 2560000000.

The previous prime is 6400039999. The next prime is 6400040041. The reversal of 6400040000 is 400046.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 510398464 + 5889641536 = 22592^2 + 76744^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40001 + ... + 120000.

Almost surely, 2^6400040000 is an apocalyptic number.

It is an amenable number.

6400040000 is an abundant number, since it is smaller than the sum of its proper divisors (9470078374).

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

6400040000 is an equidigital number, since it uses as much as digits as its factorization.

6400040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160033 (or 160008 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 6400040000 is about 80000.2499996094. The cubic root of 6400040000 is about 1856.6394014277.

Adding to 6400040000 its reverse (400046), we get a palindrome (6400440046).

The spelling of 6400040000 in words is "six billion, four hundred million, forty thousand".