6440768264 has 32 divisors (see below), whose sum is σ = 13842641280. Its totient is φ = 2752130304.

The previous prime is 6440768251. The next prime is 6440768309. The reversal of 6440768264 is 4628670446.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

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, 151772 + ... + 189515.

It is an arithmetic number, because the mean of its divisors is an integer number (432582540).

Almost surely, 2^6440768264 is an apocalyptic number.

It is an amenable number.

6440768264 is an abundant number, since it is smaller than the sum of its proper divisors (7401873016).

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

6440768264 is a wasteful number, since it uses less digits than its factorization.

6440768264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341637 (or 341633 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 47.

The square root of 6440768264 is about 80254.3971630215. The cubic root of 6440768264 is about 1860.5694737561.

The spelling of 6440768264 in words is "six billion, four hundred forty million, seven hundred sixty-eight thousand, two hundred sixty-four".