255987987 has 16 divisors (see below), whose sum is σ = 360526848. Its totient is φ = 161310240.

The previous prime is 255987971. The next prime is 255987997. The reversal of 255987987 is 789789552.

It is not a de Polignac number, because 255987987 - 2⁴ = 255987971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255987987.

It is not an unprimeable number, because it can be changed into a prime (255987937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28008 + ... + 36005.

It is an arithmetic number, because the mean of its divisors is an integer number (22532928).

Almost surely, 2^255987987 is an apocalyptic number.

255987987 is a deficient number, since it is larger than the sum of its proper divisors (104538861).

255987987 is a wasteful number, since it uses less digits than its factorization.

255987987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64090.

The product of its digits is 12700800, while the sum is 60.

The square root of 255987987 is about 15999.6245893458. The cubic root of 255987987 is about 634.9504886273.

The spelling of 255987987 in words is "two hundred fifty-five million, nine hundred eighty-seven thousand, nine hundred eighty-seven".