6529640 has 64 divisors (see below), whose sum is σ = 16405200. Its totient is φ = 2322432.

The previous prime is 6529613. The next prime is 6529651. The reversal of 6529640 is 469256.

It can be written as a sum of positive squares in 8 ways, for example, as 605284 + 5924356 = 778^2 + 2434^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6529597 and 6529606.

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, 14864 + ... + 15296.

Almost surely, 2^6529640 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 6529640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8202600).

6529640 is an abundant number, since it is smaller than the sum of its proper divisors (9875560).

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

6529640 is a wasteful number, since it uses less digits than its factorization.

6529640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 482 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 6529640 is about 2555.3160274220. The cubic root of 6529640 is about 186.9087985981.

The spelling of 6529640 in words is "six million, five hundred twenty-nine thousand, six hundred forty".