6404004004 has 6 divisors (see below), whose sum is σ = 11207007014. Its totient is φ = 3202002000.

The previous prime is 6404004001. The next prime is 6404004043. The reversal of 6404004004 is 4004004046.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4755481600 + 1648522404 = 68960^2 + 40602^2 .

It is a super-2 number, since 2×6404004004² = 82022534566496064032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6404004001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800500497 + ... + 800500504.

Almost surely, 2^6404004004 is an apocalyptic number.

It is an amenable number.

6404004004 is a deficient number, since it is larger than the sum of its proper divisors (4803003010).

6404004004 is a wasteful number, since it uses less digits than its factorization.

6404004004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601001005 (or 1601001003 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 6404004004 is about 80025.0211121497. The cubic root of 6404004004 is about 1857.0226389840.

The spelling of 6404004004 in words is "six billion, four hundred four million, four thousand, four".