2557856 has 48 divisors (see below), whose sum is σ = 6068160. Its totient is φ = 1036800.

The previous prime is 2557843. The next prime is 2557861. The reversal of 2557856 is 6587552.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3956 + ... + 4556.

It is an arithmetic number, because the mean of its divisors is an integer number (126420).

2^2557856 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 2557856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3034080).

2557856 is an abundant number, since it is smaller than the sum of its proper divisors (3510304).

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

2557856 is a wasteful number, since it uses less digits than its factorization.

2557856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 629 counting only the distinct ones).

The product of its digits is 84000, while the sum is 38.

The square root of 2557856 is about 1599.3298596600. The cubic root of 2557856 is about 136.7598756051.

The spelling of 2557856 in words is "two million, five hundred fifty-seven thousand, eight hundred fifty-six".