6621264 has 120 divisors (see below), whose sum is σ = 20852832. Its totient is φ = 2021760.

The previous prime is 6621239. The next prime is 6621281. The reversal of 6621264 is 4621266.

It is a happy number.

It is a super-2 number, since 2×6621264² = 87682273915392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50479 + ... + 50609.

Almost surely, 2^6621264 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 6621264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10426416).

6621264 is an abundant number, since it is smaller than the sum of its proper divisors (14231568).

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

6621264 is a wasteful number, since it uses less digits than its factorization.

6621264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 149 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 6621264 is about 2573.1816881052. The cubic root of 6621264 is about 187.7789767114.

The spelling of 6621264 in words is "six million, six hundred twenty-one thousand, two hundred sixty-four".