6404866420 has 24 divisors (see below), whose sum is σ = 13451896584. Its totient is φ = 2561627136.

The previous prime is 6404866397. The next prime is 6404866441. The reversal of 6404866420 is 246684046.

It can be written as a sum of positive squares in 4 ways, for example, as 426174736 + 5978691684 = 20644^2 + 77322^2 .

It is a hoax number, since the sum of its digits (40) 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 7 ways as a sum of consecutive naturals, for example, 207852 + ... + 236668.

It is an arithmetic number, because the mean of its divisors is an integer number (560495691).

Almost surely, 2^6404866420 is an apocalyptic number.

It is an amenable number.

6404866420 is an abundant number, since it is smaller than the sum of its proper divisors (7047030164).

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

6404866420 is a wasteful number, since it uses less digits than its factorization.

6404866420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39939 (or 39937 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 6404866420 is about 80030.4093454482. The cubic root of 6404866420 is about 1857.1059959040.

The spelling of 6404866420 in words is "six billion, four hundred four million, eight hundred sixty-six thousand, four hundred twenty".