255681636 has 48 divisors (see below), whose sum is σ = 688214016. Its totient is φ = 72366624.

The previous prime is 255681623. The next prime is 255681641. The reversal of 255681636 is 636186552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5236 + ... + 23211.

It is an arithmetic number, because the mean of its divisors is an integer number (14337792).

Almost surely, 2^255681636 is an apocalyptic number.

It is an amenable number.

255681636 is an abundant number, since it is smaller than the sum of its proper divisors (432532380).

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

255681636 is a wasteful number, since it uses less digits than its factorization.

255681636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28568 (or 28566 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 255681636 is about 15990.0480299466. The cubic root of 255681636 is about 634.6970973559.

The spelling of 255681636 in words is "two hundred fifty-five million, six hundred eighty-one thousand, six hundred thirty-six".