255688889 has 4 divisors (see below), whose sum is σ = 256374756. Its totient is φ = 255003024.

The previous prime is 255688859. The next prime is 255688897. The reversal of 255688889 is 988886552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 158961664 + 96727225 = 12608^2 + 9835^2 .

It is a cyclic number.

It is not a de Polignac number, because 255688889 - 2⁸ = 255688633 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (255688859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342374 + ... + 343119.

It is an arithmetic number, because the mean of its divisors is an integer number (64093689).

Almost surely, 2^255688889 is an apocalyptic number.

It is an amenable number.

255688889 is a deficient number, since it is larger than the sum of its proper divisors (685867).

255688889 is an equidigital number, since it uses as much as digits as its factorization.

255688889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685866.

The product of its digits is 11059200, while the sum is 59.

The square root of 255688889 is about 15990.2748256557. The cubic root of 255688889 is about 634.7030988488.

The spelling of 255688889 in words is "two hundred fifty-five million, six hundred eighty-eight thousand, eight hundred eighty-nine".