285315855 has 16 divisors (see below), whose sum is σ = 498006144. Its totient is φ = 138334880.

The previous prime is 285315829. The next prime is 285315869. The reversal of 285315855 is 558513582.

It is not a de Polignac number, because 285315855 - 2⁶ = 285315791 is a prime.

It is a super-4 number, since 4×285315855⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

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, 864429 + ... + 864758.

It is an arithmetic number, because the mean of its divisors is an integer number (31125384).

Almost surely, 2^285315855 is an apocalyptic number.

285315855 is a deficient number, since it is larger than the sum of its proper divisors (212690289).

285315855 is a wasteful number, since it uses less digits than its factorization.

285315855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729206.

The product of its digits is 240000, while the sum is 42.

The square root of 285315855 is about 16891.2952434087. The cubic root of 285315855 is about 658.3274570146.

The spelling of 285315855 in words is "two hundred eighty-five million, three hundred fifteen thousand, eight hundred fifty-five".