6640632 has 48 divisors (see below), whose sum is σ = 18135000. Its totient is φ = 2195136.

The previous prime is 6640631. The next prime is 6640639. The reversal of 6640632 is 2360466.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6640596 and 6640605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10419 + ... + 11037.

Almost surely, 2^6640632 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 6640632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9067500).

6640632 is an abundant number, since it is smaller than the sum of its proper divisors (11494368).

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

6640632 is a wasteful number, since it uses less digits than its factorization.

6640632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 6640632 is about 2576.9423742102. The cubic root of 6640632 is about 187.9618905702.

The spelling of 6640632 in words is "six million, six hundred forty thousand, six hundred thirty-two".