6649812 has 54 divisors (see below), whose sum is σ = 18218382. Its totient is φ = 2044224.

The previous prime is 6649801. The next prime is 6649823. The reversal of 6649812 is 2189466.

6649812 is a `hidden beast` number, since 6 + 649 + 8 + 1 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (6649801) and next prime (6649823).

It can be written as a sum of positive squares in 3 ways, for example, as 715716 + 5934096 = 846^2 + 2436^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5538 + ... + 6630.

Almost surely, 2^6649812 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 6649812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9109191).

6649812 is an abundant number, since it is smaller than the sum of its proper divisors (11568570).

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

6649812 is a wasteful number, since it uses less digits than its factorization.

6649812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1111 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 6649812 is about 2578.7229397514. The cubic root of 6649812 is about 188.0484634376.

The spelling of 6649812 in words is "six million, six hundred forty-nine thousand, eight hundred twelve".