2556890 has 16 divisors (see below), whose sum is σ = 5260032. Its totient is φ = 876624.

The previous prime is 2556877. The next prime is 2556907. The reversal of 2556890 is 986552.

2556890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2556890.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18194 + ... + 18333.

It is an arithmetic number, because the mean of its divisors is an integer number (328752).

2^2556890 is an apocalyptic number.

2556890 is an abundant number, since it is smaller than the sum of its proper divisors (2703142).

2556890 is a wasteful number, since it uses less digits than its factorization.

2556890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36541.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 2556890 is about 1599.0278296515. The cubic root of 2556890 is about 136.7426571907.

The spelling of 2556890 in words is "two million, five hundred fifty-six thousand, eight hundred ninety".