255870387 has 16 divisors (see below), whose sum is σ = 384727680. Its totient is φ = 168033096.

The previous prime is 255870371. The next prime is 255870389. The reversal of 255870387 is 783078552.

It is not a de Polignac number, because 255870387 - 2⁴ = 255870371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255870389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68913 + ... + 72530.

It is an arithmetic number, because the mean of its divisors is an integer number (24045480).

Almost surely, 2^255870387 is an apocalyptic number.

255870387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

255870387 is a deficient number, since it is larger than the sum of its proper divisors (128857293).

255870387 is a wasteful number, since it uses less digits than its factorization.

255870387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141519 (or 141513 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The square root of 255870387 is about 15995.9490809392. The cubic root of 255870387 is about 634.8532423780.

The spelling of 255870387 in words is "two hundred fifty-five million, eight hundred seventy thousand, three hundred eighty-seven".