6404646912 has 144 divisors (see below), whose sum is σ = 18143405280. Its totient is φ = 2008743936.

The previous prime is 6404646889. The next prime is 6404646931. The reversal of 6404646912 is 2196464046.

It is a super-2 number, since 2×6404646912² = 82039004134782271488, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1773813 + ... + 1777419.

It is an arithmetic number, because the mean of its divisors is an integer number (125995870).

Almost surely, 2^6404646912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6404646912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9071702640).

6404646912 is an abundant number, since it is smaller than the sum of its proper divisors (11738758368).

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

6404646912 is a wasteful number, since it uses less digits than its factorization.

6404646912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666 (or 3629 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 6404646912 is about 80029.0379299914. The cubic root of 6404646912 is about 1857.0847800424.

The spelling of 6404646912 in words is "six billion, four hundred four million, six hundred forty-six thousand, nine hundred twelve".