6405800844 has 12 divisors (see below), whose sum is σ = 14946868664. Its totient is φ = 2135266944.

The previous prime is 6405800831. The next prime is 6405800887. The reversal of 6405800844 is 4480085046.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×6405800844² = 82068568905982224672, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 266908357 + ... + 266908380.

Almost surely, 2^6405800844 is an apocalyptic number.

It is an amenable number.

6405800844 is an abundant number, since it is smaller than the sum of its proper divisors (8541067820).

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

6405800844 is a wasteful number, since it uses less digits than its factorization.

6405800844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533816744 (or 533816742 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 39.

The square root of 6405800844 is about 80036.2470634399. The cubic root of 6405800844 is about 1857.1963043204.

The spelling of 6405800844 in words is "six billion, four hundred five million, eight hundred thousand, eight hundred forty-four".