6404407081 has 4 divisors (see below), whose sum is σ = 6442756992. Its totient is φ = 6366057172.

The previous prime is 6404407049. The next prime is 6404407111. The reversal of 6404407081 is 1807044046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6404407081 - 2⁵ = 6404407049 is a prime.

It is a super-2 number, since 2×6404407081² = 82032860118325881122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6404407021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19174705 + ... + 19175038.

It is an arithmetic number, because the mean of its divisors is an integer number (1610689248).

Almost surely, 2^6404407081 is an apocalyptic number.

It is an amenable number.

6404407081 is a deficient number, since it is larger than the sum of its proper divisors (38349911).

6404407081 is a wasteful number, since it uses less digits than its factorization.

6404407081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38349910.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 6404407081 is about 80027.5395160941. The cubic root of 6404407081 is about 1857.0615993703.

The spelling of 6404407081 in words is "six billion, four hundred four million, four hundred seven thousand, eighty-one".