6439880396 has 24 divisors (see below), whose sum is σ = 11388385680. Its totient is φ = 3186150912.

The previous prime is 6439880393. The next prime is 6439880431. The reversal of 6439880396 is 6930889346.

It is not an unprimeable number, because it can be changed into a prime (6439880393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268280 + ... + 291296.

It is an arithmetic number, because the mean of its divisors is an integer number (474516070).

Almost surely, 2^6439880396 is an apocalyptic number.

It is an amenable number.

6439880396 is a deficient number, since it is larger than the sum of its proper divisors (4948505284).

6439880396 is a wasteful number, since it uses less digits than its factorization.

6439880396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23753 (or 23751 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 56.

The square root of 6439880396 is about 80248.8653876178. The cubic root of 6439880396 is about 1860.4839758805.

The spelling of 6439880396 in words is "six billion, four hundred thirty-nine million, eight hundred eighty thousand, three hundred ninety-six".