287860869 has 12 divisors (see below), whose sum is σ = 416258700. Its totient is φ = 191695104.

The previous prime is 287860829. The next prime is 287860871. The reversal of 287860869 is 968068782.

287860869 is a `hidden beast` number, since 28 + 7 + 8 + 608 + 6 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 266930244 = 4575^2 + 16338^2 .

It is not a de Polignac number, because 287860869 - 2⁹ = 287860357 is a prime.

It is a super-2 number, since 2×287860869² = 165727759802870322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287860829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8854 + ... + 25575.

It is an arithmetic number, because the mean of its divisors is an integer number (34688225).

Almost surely, 2^287860869 is an apocalyptic number.

It is an amenable number.

287860869 is a deficient number, since it is larger than the sum of its proper divisors (128397831).

287860869 is a wasteful number, since it uses less digits than its factorization.

287860869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35364 (or 35361 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 287860869 is about 16966.4630668858. The cubic root of 287860869 is about 660.2790899554.

The spelling of 287860869 in words is "two hundred eighty-seven million, eight hundred sixty thousand, eight hundred sixty-nine".