285128907 has 32 divisors (see below), whose sum is σ = 455334912. Its totient is φ = 155172864.

The previous prime is 285128903. The next prime is 285128911. The reversal of 285128907 is 709821582.

It is an interprime number because it is at equal distance from previous prime (285128903) and next prime (285128911).

It is not a de Polignac number, because 285128907 - 2² = 285128903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (285128903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122983 + ... + 125279.

It is an arithmetic number, because the mean of its divisors is an integer number (14229216).

Almost surely, 2^285128907 is an apocalyptic number.

285128907 is a deficient number, since it is larger than the sum of its proper divisors (170206005).

285128907 is a wasteful number, since it uses less digits than its factorization.

285128907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 285128907 is about 16885.7604803574. The cubic root of 285128907 is about 658.1836399203.

The spelling of 285128907 in words is "two hundred eighty-five million, one hundred twenty-eight thousand, nine hundred seven".