6440396258 has 16 divisors (see below), whose sum is σ = 9979075584. Its totient is φ = 3114180480.

The previous prime is 6440396219. The next prime is 6440396279. The reversal of 6440396258 is 8526930446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57266 + ... + 127122.

It is an arithmetic number, because the mean of its divisors is an integer number (623692224).

Almost surely, 2^6440396258 is an apocalyptic number.

6440396258 is a deficient number, since it is larger than the sum of its proper divisors (3538679326).

6440396258 is a wasteful number, since it uses less digits than its factorization.

6440396258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71377.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The square root of 6440396258 is about 80252.0794621547. The cubic root of 6440396258 is about 1860.5336521322.

The spelling of 6440396258 in words is "six billion, four hundred forty million, three hundred ninety-six thousand, two hundred fifty-eight".