287816 has 8 divisors (see below), whose sum is σ = 539670. Its totient is φ = 143904.

The previous prime is 287813. The next prime is 287821. The reversal of 287816 is 618782.

It can be written as a sum of positive squares in only one way, i.e., 168100 + 119716 = 410^2 + 346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a d-powerful number, because it can be written as 2¹⁰ + 8² + 8⁶ + 7⁵ + 1 + 6⁵ .

It is not an unprimeable number, because it can be changed into a prime (287813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17981 + ... + 17996.

2²⁸⁷⁸¹⁶ is an apocalyptic number.

It is an amenable number.

287816 is a deficient number, since it is larger than the sum of its proper divisors (251854).

287816 is a wasteful number, since it uses less digits than its factorization.

287816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35983 (or 35979 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 287816 is about 536.4848553314. The cubic root of 287816 is about 66.0244782176.

The spelling of 287816 in words is "two hundred eighty-seven thousand, eight hundred sixteen".