6640956 has 108 divisors (see below), whose sum is σ = 20525232. Its totient is φ = 1772928.

The previous prime is 6640939. The next prime is 6640967. The reversal of 6640956 is 6590466.

It is a happy number.

6640956 is a `hidden beast` number, since 6 + 640 + 9 + 5 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6640956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90936 + ... + 91008.

Almost surely, 2^6640956 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 6640956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10262616).

6640956 is an abundant number, since it is smaller than the sum of its proper divisors (13884276).

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

6640956 is a wasteful number, since it uses less digits than its factorization.

6640956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6640956 is about 2577.0052386443. The cubic root of 6640956 is about 187.9649474410.

The spelling of 6640956 in words is "six million, six hundred forty thousand, nine hundred fifty-six".