6405256 has 48 divisors (see below), whose sum is σ = 14244300. Its totient is φ = 2682240.

The previous prime is 6405221. The next prime is 6405263. The reversal of 6405256 is 6525046.

6405256 = T₂₆₃ + T₂₆₄ + ... + T₃₈₃.

It can be written as a sum of positive squares in 2 ways, for example, as 6400900 + 4356 = 2530^2 + 66^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12330 + ... + 12838.

Almost surely, 2^6405256 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 6405256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7122150).

6405256 is an abundant number, since it is smaller than the sum of its proper divisors (7839044).

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

6405256 is a wasteful number, since it uses less digits than its factorization.

6405256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 6405256 is about 2530.8607231533. The cubic root of 6405256 is about 185.7143648351.

The spelling of 6405256 in words is "six million, four hundred five thousand, two hundred fifty-six".