6404490321 has 16 divisors (see below), whose sum is σ = 8984024448. Its totient is φ = 4052937600.

The previous prime is 6404490307. The next prime is 6404490349. The reversal of 6404490321 is 1230944046.

It is not a de Polignac number, because 6404490321 - 2¹¹ = 6404488273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6404490371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 699085 + ... + 708186.

It is an arithmetic number, because the mean of its divisors is an integer number (561501528).

Almost surely, 2^6404490321 is an apocalyptic number.

It is an amenable number.

6404490321 is a deficient number, since it is larger than the sum of its proper divisors (2579534127).

6404490321 is a wasteful number, since it uses less digits than its factorization.

6404490321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407352.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 6404490321 is about 80028.0595853729. The cubic root of 6404490321 is about 1857.0696449310.

The spelling of 6404490321 in words is "six billion, four hundred four million, four hundred ninety thousand, three hundred twenty-one".