6650644 has 72 divisors (see below), whose sum is σ = 15849344. Its totient is φ = 2376000.

The previous prime is 6650629. The next prime is 6650659. The reversal of 6650644 is 4460566.

It is an interprime number because it is at equal distance from previous prime (6650629) and next prime (6650659).

It is a super-2 number, since 2×6650644² = 88462131229472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43969 + ... + 44119.

Almost surely, 2^6650644 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 6650644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7924672).

6650644 is an abundant number, since it is smaller than the sum of its proper divisors (9198700).

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

6650644 is a wasteful number, since it uses less digits than its factorization.

6650644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6650644 is about 2578.8842548668. The cubic root of 6650644 is about 188.0563057544.

The spelling of 6650644 in words is "six million, six hundred fifty thousand, six hundred forty-four".