2256636 has 24 divisors (see below), whose sum is σ = 5289984. Its totient is φ = 748720.

The previous prime is 2256629. The next prime is 2256637. The reversal of 2256636 is 6366522.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁸ + 2¹⁸ + 5⁸ + 6³ + 6⁴ + 3¹³ + 6⁵ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2256637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4351 + ... + 4841.

It is an arithmetic number, because the mean of its divisors is an integer number (220416).

2^2256636 is an apocalyptic number.

It is an amenable number.

2256636 is an abundant number, since it is smaller than the sum of its proper divisors (3033348).

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

2256636 is a wasteful number, since it uses less digits than its factorization.

2256636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 879 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 2256636 is about 1502.2103714194. The cubic root of 2256636 is about 131.1657672684.

The spelling of 2256636 in words is "two million, two hundred fifty-six thousand, six hundred thirty-six".