6599640 has 64 divisors (see below), whose sum is σ = 20275200. Its totient is φ = 1717632.

The previous prime is 6599639. The next prime is 6599687. The reversal of 6599640 is 469956.

6599640 is digitally balanced in base 4 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4521 + ... + 5799.

It is an arithmetic number, because the mean of its divisors is an integer number (316800).

Almost surely, 2^6599640 is an apocalyptic number.

6599640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6599640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10137600).

6599640 is an abundant number, since it is smaller than the sum of its proper divisors (13675560).

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

6599640 is a wasteful number, since it uses less digits than its factorization.

6599640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1332 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 6599640 is about 2568.9764498726. The cubic root of 6599640 is about 187.5743349702.

The spelling of 6599640 in words is "six million, five hundred ninety-nine thousand, six hundred forty".