2556568 has 32 divisors (see below), whose sum is σ = 5564160. Its totient is φ = 1078560.

The previous prime is 2556559. The next prime is 2556569. The reversal of 2556568 is 8656552.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3655 + ... + 4297.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2^2556568 is an apocalyptic number.

2556568 is a gapful number since it is divisible by the number (28) 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 2556568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2782080).

2556568 is an abundant number, since it is smaller than the sum of its proper divisors (3007592).

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

2556568 is a wasteful number, since it uses less digits than its factorization.

2556568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727 (or 723 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 2556568 is about 1598.9271403038. The cubic root of 2556568 is about 136.7369167555.

The spelling of 2556568 in words is "two million, five hundred fifty-six thousand, five hundred sixty-eight".