255781224 has 24 divisors (see below), whose sum is σ = 692741010. Its totient is φ = 85260384.

The previous prime is 255781219. The next prime is 255781237. The reversal of 255781224 is 422187552.

It is a happy number.

255781224 is a `hidden beast` number, since 2 + 557 + 81 + 2 + 24 = 666.

It can be written as a sum of positive squares in only one way, i.e., 255680100 + 101124 = 15990^2 + 318^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1776187 + ... + 1776330.

Almost surely, 2^255781224 is an apocalyptic number.

255781224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

255781224 is an abundant number, since it is smaller than the sum of its proper divisors (436959786).

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

255781224 is a wasteful number, since it uses less digits than its factorization.

255781224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3552529 (or 3552522 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 255781224 is about 15993.1617887146. The cubic root of 255781224 is about 634.7794915014.

The spelling of 255781224 in words is "two hundred fifty-five million, seven hundred eighty-one thousand, two hundred twenty-four".