287284 has 6 divisors (see below), whose sum is σ = 502754. Its totient is φ = 143640.

The previous prime is 287281. The next prime is 287291. The reversal of 287284 is 482782.

287284 = T₃₇₇ + T₃₇₈ + ... + T₃₈₀.

It can be written as a sum of positive squares in only one way, i.e., 144400 + 142884 = 380^2 + 378^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35907 + ... + 35914.

2²⁸⁷²⁸⁴ is an apocalyptic number.

It is an amenable number.

287284 is a deficient number, since it is larger than the sum of its proper divisors (215470).

287284 is a wasteful number, since it uses less digits than its factorization.

287284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71825 (or 71823 counting only the distinct ones).

The product of its digits is 7168, while the sum is 31.

The square root of 287284 is about 535.9888058533. The cubic root of 287284 is about 65.9837731764.

The spelling of 287284 in words is "two hundred eighty-seven thousand, two hundred eighty-four".