255643236 has 96 divisors (see below), whose sum is σ = 708019200. Its totient is φ = 79591680.

The previous prime is 255643231. The next prime is 255643273. The reversal of 255643236 is 632346552.

255643236 is a `hidden beast` number, since 2 + 5 + 5 + 643 + 2 + 3 + 6 = 666.

It is a super-2 number, since 2×255643236² = 130706928225103392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 255643236.

It is not an unprimeable number, because it can be changed into a prime (255643231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95776 + ... + 98408.

It is an arithmetic number, because the mean of its divisors is an integer number (7375200).

Almost surely, 2^255643236 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 255643236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354009600).

255643236 is an abundant number, since it is smaller than the sum of its proper divisors (452375964).

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

255643236 is a wasteful number, since it uses less digits than its factorization.

255643236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706 (or 2698 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 255643236 is about 15988.8472379969. The cubic root of 255643236 is about 634.6653213953.

Adding to 255643236 its reverse (632346552), we get a palindrome (887989788).

The spelling of 255643236 in words is "two hundred fifty-five million, six hundred forty-three thousand, two hundred thirty-six".