6646432 has 36 divisors (see below), whose sum is σ = 14180670. Its totient is φ = 3065088.

The previous prime is 6646429. The next prime is 6646477. The reversal of 6646432 is 2346466.

It can be written as a sum of positive squares in 3 ways, for example, as 5400976 + 1245456 = 2324^2 + 1116^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6646394 and 6646403.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4794 + ... + 6022.

Almost surely, 2^6646432 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 6646432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7090335).

6646432 is an abundant number, since it is smaller than the sum of its proper divisors (7534238).

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

6646432 is a wasteful number, since it uses less digits than its factorization.

6646432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1244 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 6646432 is about 2578.0674932980. The cubic root of 6646432 is about 188.0165972973.

The spelling of 6646432 in words is "six million, six hundred forty-six thousand, four hundred thirty-two".