6404015990 has 16 divisors (see below), whose sum is σ = 11586958848. Its totient is φ = 2548333056.

The previous prime is 6404015983. The next prime is 6404016001. The reversal of 6404015990 is 995104046.

It is a super-2 number, since 2×6404015990² = 82022841600351360200, which contains 22 as substring.

It is a Curzon number.

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, 1657142 + ... + 1661001.

It is an arithmetic number, because the mean of its divisors is an integer number (724184928).

Almost surely, 2^6404015990 is an apocalyptic number.

6404015990 is a deficient number, since it is larger than the sum of its proper divisors (5182942858).

6404015990 is a wasteful number, since it uses less digits than its factorization.

6404015990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318343.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 6404015990 is about 80025.0960011920. The cubic root of 6404015990 is about 1857.0237975435.

The spelling of 6404015990 in words is "six billion, four hundred four million, fifteen thousand, nine hundred ninety".