6651648 has 54 divisors (see below), whose sum is σ = 19184984. Its totient is φ = 2216448.

The previous prime is 6651647. The next prime is 6651649. The reversal of 6651648 is 8461566.

6651648 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 648 = 666.

It is an interprime number because it is at equal distance from previous prime (6651647) and next prime (6651649).

It is a super-2 number, since 2×6651648² = 88488842231808, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 861 + ... + 3747.

Almost surely, 2^6651648 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 6651648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9592492).

6651648 is an abundant number, since it is smaller than the sum of its proper divisors (12533336).

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

6651648 is a wasteful number, since it uses less digits than its factorization.

6651648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909 (or 2892 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6651648 is about 2579.0789053459. The cubic root of 6651648 is about 188.0657684486.

It can be divided in two parts, 66516 and 48, that added together give a square (66564 = 258²).

The spelling of 6651648 in words is "six million, six hundred fifty-one thousand, six hundred forty-eight".