256436236 has 48 divisors (see below), whose sum is σ = 541497600. Its totient is φ = 103802688.

The previous prime is 256436231. The next prime is 256436249. The reversal of 256436236 is 632634652.

It is a junction number, because it is equal to n+sod(n) for n = 256436195 and 256436204.

It is not an unprimeable number, because it can be changed into a prime (256436231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270315 + ... + 271261.

It is an arithmetic number, because the mean of its divisors is an integer number (11281200).

Almost surely, 2^256436236 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 256436236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270748800).

256436236 is an abundant number, since it is smaller than the sum of its proper divisors (285061364).

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

256436236 is a wasteful number, since it uses less digits than its factorization.

256436236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486 (or 1484 counting only the distinct ones).

The product of its digits is 155520, while the sum is 37.

The square root of 256436236 is about 16013.6265723914. The cubic root of 256436236 is about 635.3208835565.

The spelling of 256436236 in words is "two hundred fifty-six million, four hundred thirty-six thousand, two hundred thirty-six".