6647264 has 72 divisors (see below), whose sum is σ = 15364440. Its totient is φ = 2806272.

The previous prime is 6647243. The next prime is 6647269. The reversal of 6647264 is 4627466.

It is a happy number.

It is a super-2 number, since 2×6647264² = 88372237371392, which contains 22 as substring.

Its product of digits (48384) is a multiple of the sum of its prime divisors (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229202 + ... + 229230.

It is an arithmetic number, because the mean of its divisors is an integer number (213395).

Almost surely, 2^6647264 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 6647264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7682220).

6647264 is an abundant number, since it is smaller than the sum of its proper divisors (8717176).

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

6647264 is a wasteful number, since it uses less digits than its factorization.

6647264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 63 counting only the distinct ones).

The product of its digits is 48384, while the sum is 35.

The square root of 6647264 is about 2578.2288494236. The cubic root of 6647264 is about 188.0244422725.

The spelling of 6647264 in words is "six million, six hundred forty-seven thousand, two hundred sixty-four".