6525440 has 40 divisors (see below), whose sum is σ = 15651900. Its totient is φ = 2609152.

The previous prime is 6525427. The next prime is 6525443. The reversal of 6525440 is 445256.

It can be written as a sum of positive squares in 2 ways, for example, as 6310144 + 215296 = 2512^2 + 464^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (6525443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1286 + ... + 3834.

Almost surely, 2^6525440 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 6525440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7825950).

6525440 is an abundant number, since it is smaller than the sum of its proper divisors (9126460).

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

6525440 is an equidigital number, since it uses as much as digits as its factorization.

6525440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2572 (or 2556 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 6525440 is about 2554.4940790693. The cubic root of 6525440 is about 186.8687154630.

The spelling of 6525440 in words is "six million, five hundred twenty-five thousand, four hundred forty".