6459640 has 64 divisors (see below), whose sum is σ = 16212960. Its totient is φ = 2296320.

The previous prime is 6459637. The next prime is 6459659. The reversal of 6459640 is 469546.

It is a junction number, because it is equal to n+sod(n) for n = 6459596 and 6459605.

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, 23182 + ... + 23458.

Almost surely, 2^6459640 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 6459640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8106480).

6459640 is an abundant number, since it is smaller than the sum of its proper divisors (9753320).

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

6459640 is a wasteful number, since it uses less digits than its factorization.

6459640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 6459640 is about 2541.5821843883. The cubic root of 6459640 is about 186.2384885458.

The spelling of 6459640 in words is "six million, four hundred fifty-nine thousand, six hundred forty".