6401800808 has 64 divisors (see below), whose sum is σ = 13392162000. Its totient is φ = 2848591872.

The previous prime is 6401800799. The next prime is 6401800831. The reversal of 6401800808 is 8080081046.

It can be written as a sum of positive squares in 8 ways, for example, as 2497800484 + 3904000324 = 49978^2 + 62482^2 .

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 15 ways as a sum of consecutive naturals, for example, 3005888 + ... + 3008016.

Almost surely, 2^6401800808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6401800808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6696081000).

6401800808 is an abundant number, since it is smaller than the sum of its proper divisors (6990361192).

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

6401800808 is a wasteful number, since it uses less digits than its factorization.

6401800808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174 (or 3170 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 6401800808 is about 80011.2542583854. The cubic root of 6401800808 is about 1856.8096548296.

The spelling of 6401800808 in words is "six billion, four hundred one million, eight hundred thousand, eight hundred eight".