6440706868 has 12 divisors (see below), whose sum is σ = 11864460160. Its totient is φ = 3050861112.

The previous prime is 6440706841. The next prime is 6440706901. The reversal of 6440706868 is 8686070446.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42372996 + ... + 42373147.

Almost surely, 2^6440706868 is an apocalyptic number.

It is an amenable number.

6440706868 is a deficient number, since it is larger than the sum of its proper divisors (5423753292).

6440706868 is a wasteful number, since it uses less digits than its factorization.

6440706868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84746166 (or 84746164 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 49.

The square root of 6440706868 is about 80254.0146534739. The cubic root of 6440706868 is about 1860.5635618378.

The spelling of 6440706868 in words is "six billion, four hundred forty million, seven hundred six thousand, eight hundred sixty-eight".