287228 has 6 divisors (see below), whose sum is σ = 502656. Its totient is φ = 143612.

The previous prime is 287219. The next prime is 287233. The reversal of 287228 is 822782.

It is a self number, because there is not a number n which added to its sum of digits gives 287228.

It is a congruent number.

It is an unprimeable number.

287228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35900 + ... + 35907.

It is an arithmetic number, because the mean of its divisors is an integer number (83776).

2²⁸⁷²²⁸ is an apocalyptic number.

It is an amenable number.

287228 is a deficient number, since it is larger than the sum of its proper divisors (215428).

287228 is a wasteful number, since it uses less digits than its factorization.

287228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71811 (or 71809 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 287228 is about 535.9365634103. The cubic root of 287228 is about 65.9794855128.

It can be divided in two parts, 287 and 228, that added together give a palindrome (515).

The spelling of 287228 in words is "two hundred eighty-seven thousand, two hundred twenty-eight".