285257867 has 2 divisors, whose sum is σ = 285257868. Its totient is φ = 285257866.

The previous prime is 285257857. The next prime is 285257911. The reversal of 285257867 is 768752582.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 285257867 - 2⁴ = 285257851 is a prime.

It is not a weakly prime, because it can be changed into another prime (285257857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142628933 + 142628934.

It is an arithmetic number, because the mean of its divisors is an integer number (142628934).

Almost surely, 2^285257867 is an apocalyptic number.

285257867 is a deficient number, since it is larger than the sum of its proper divisors (1).

285257867 is an equidigital number, since it uses as much as digits as its factorization.

285257867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881600, while the sum is 50.

The square root of 285257867 is about 16889.5786507538. The cubic root of 285257867 is about 658.2828541900.

The spelling of 285257867 in words is "two hundred eighty-five million, two hundred fifty-seven thousand, eight hundred sixty-seven".