6535440 has 120 divisors (see below), whose sum is σ = 22777560. Its totient is φ = 1677312.

The previous prime is 6535391. The next prime is 6535457. The reversal of 6535440 is 445356.

6535440 is a `hidden beast` number, since 653 + 5 + 4 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2304 + 6533136 = 48^2 + 2556^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20724 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (189813).

Almost surely, 2^6535440 is an apocalyptic number.

6535440 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 6535440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11388780).

6535440 is an abundant number, since it is smaller than the sum of its proper divisors (16242120).

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

6535440 is a wasteful number, since it uses less digits than its factorization.

6535440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 6535440 is about 2556.4506644956. The cubic root of 6535440 is about 186.9641232516.

The spelling of 6535440 in words is "six million, five hundred thirty-five thousand, four hundred forty".