287858985 has 16 divisors (see below), whose sum is σ = 471286464. Its totient is φ = 149954112.

The previous prime is 287858983. The next prime is 287858993. The reversal of 287858985 is 589858782.

It is a happy number.

It is not a de Polignac number, because 287858985 - 2¹ = 287858983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (287858981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222502 + ... + 223791.

It is an arithmetic number, because the mean of its divisors is an integer number (29455404).

Almost surely, 2^287858985 is an apocalyptic number.

It is an amenable number.

287858985 is a deficient number, since it is larger than the sum of its proper divisors (183427479).

287858985 is a wasteful number, since it uses less digits than its factorization.

287858985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446344.

The product of its digits is 12902400, while the sum is 60.

The square root of 287858985 is about 16966.4075455000. The cubic root of 287858985 is about 660.2776494811.

The spelling of 287858985 in words is "two hundred eighty-seven million, eight hundred fifty-eight thousand, nine hundred eighty-five".