2256787 has 4 divisors (see below), whose sum is σ = 2430400. Its totient is φ = 2083176.

The previous prime is 2256781. The next prime is 2256791. The reversal of 2256787 is 7876522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2256787 - 2¹⁹ = 1732499 is a prime.

It is a d-powerful number, because it can be written as 2⁶ + 2¹⁸ + 5⁹ + 6⁵ + 7⁵ + 8² + 7⁵ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2256781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86787 + ... + 86812.

It is an arithmetic number, because the mean of its divisors is an integer number (607600).

2^2256787 is an apocalyptic number.

2256787 is a deficient number, since it is larger than the sum of its proper divisors (173613).

2256787 is a wasteful number, since it uses less digits than its factorization.

2256787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173612.

The product of its digits is 47040, while the sum is 37.

The square root of 2256787 is about 1502.2606298509. The cubic root of 2256787 is about 131.1686928014.

Subtracting from 2256787 its sum of digits (37), we obtain a triangular number (2256750 = T₂₁₂₄).

The spelling of 2256787 in words is "two million, two hundred fifty-six thousand, seven hundred eighty-seven".