6646820 has 24 divisors (see below), whose sum is σ = 14091000. Its totient is φ = 2633472.

The previous prime is 6646819. The next prime is 6646831. The reversal of 6646820 is 286466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 256036 + 6390784 = 506^2 + 2528^2 .

It is a super-2 number, since 2×6646820² = 88360432224800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656 + ... + 3704.

It is an arithmetic number, because the mean of its divisors is an integer number (587125).

Almost surely, 2^6646820 is an apocalyptic number.

It is an amenable number.

6646820 is an abundant number, since it is smaller than the sum of its proper divisors (7444180).

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

6646820 is a wasteful number, since it uses less digits than its factorization.

6646820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167 (or 3165 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 6646820 is about 2578.1427423632. The cubic root of 6646820 is about 188.0202558528.

The spelling of 6646820 in words is "six million, six hundred forty-six thousand, eight hundred twenty".