255643986 has 32 divisors (see below), whose sum is σ = 551295360. Its totient is φ = 78562944.

The previous prime is 255643967. The next prime is 255644017. The reversal of 255643986 is 689346552.

Its product of digits (1555200) is a multiple of the sum of its prime divisors (4050).

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, 86611 + ... + 89513.

It is an arithmetic number, because the mean of its divisors is an integer number (17227980).

Almost surely, 2^255643986 is an apocalyptic number.

255643986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

255643986 is an abundant number, since it is smaller than the sum of its proper divisors (295651374).

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

255643986 is a wasteful number, since it uses less digits than its factorization.

255643986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050.

The product of its digits is 1555200, while the sum is 48.

The square root of 255643986 is about 15988.8706918281. The cubic root of 255643986 is about 634.6659420500.

The spelling of 255643986 in words is "two hundred fifty-five million, six hundred forty-three thousand, nine hundred eighty-six".