6646464 has 84 divisors (see below), whose sum is σ = 20802600. Its totient is φ = 2012160.

The previous prime is 6646429. The next prime is 6646477. The reversal of 6646464 is 4646466.

It is a happy number.

6646464 is a `hidden beast` number, since 6 + 6 + 4 + 646 + 4 = 666.

6646464 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

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, 5812 + ... + 6860.

It is an arithmetic number, because the mean of its divisors is an integer number (247650).

Almost surely, 2^6646464 is an apocalyptic number.

6646464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10401300).

6646464 is an abundant number, since it is smaller than the sum of its proper divisors (14156136).

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

6646464 is a wasteful number, since it uses less digits than its factorization.

6646464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1065 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 6646464 is about 2578.0736994896. The cubic root of 6646464 is about 188.0168990392.

The spelling of 6646464 in words is "six million, six hundred forty-six thousand, four hundred sixty-four".