6404490320 has 40 divisors (see below), whose sum is σ = 15171401736. Its totient is φ = 2513458688.

The previous prime is 6404490307. The next prime is 6404490349. The reversal of 6404490320 is 230944046.

It can be written as a sum of positive squares in 4 ways, for example, as 769285696 + 5635204624 = 27736^2 + 75068^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 751007 + ... + 759486.

Almost surely, 2^6404490320 is an apocalyptic number.

It is an amenable number.

6404490320 is an abundant number, since it is smaller than the sum of its proper divisors (8766911416).

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

6404490320 is a wasteful number, since it uses less digits than its factorization.

6404490320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510559 (or 1510553 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 6404490320 is about 80028.0595791251. The cubic root of 6404490320 is about 1857.0696448343.

The spelling of 6404490320 in words is "six billion, four hundred four million, four hundred ninety thousand, three hundred twenty".