287842869 has 32 divisors (see below), whose sum is σ = 444071040. Its totient is φ = 184104576.

The previous prime is 287842859. The next prime is 287842879. The reversal of 287842869 is 968248782.

287842869 is a `hidden beast` number, since 287 + 84 + 286 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (287842859) and next prime (287842879).

It is not a de Polignac number, because 287842869 - 2¹² = 287838773 is a prime.

It is a super-2 number, since 2×287842869² = 165707034468302322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287842859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70954 + ... + 74900.

It is an arithmetic number, because the mean of its divisors is an integer number (13877220).

Almost surely, 2^287842869 is an apocalyptic number.

It is an amenable number.

287842869 is a deficient number, since it is larger than the sum of its proper divisors (156228171).

287842869 is a wasteful number, since it uses less digits than its factorization.

287842869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066 (or 4060 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 287842869 is about 16965.9326003612. The cubic root of 287842869 is about 660.2653272056.

The spelling of 287842869 in words is "two hundred eighty-seven million, eight hundred forty-two thousand, eight hundred sixty-nine".