287506 has 8 divisors (see below), whose sum is σ = 446220. Its totient is φ = 138768.

The previous prime is 287503. The next prime is 287537. The reversal of 287506 is 605782.

It can be written as a sum of positive squares in 2 ways, for example, as 275625 + 11881 = 525^2 + 109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (287501) 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 in 3 ways as a sum of consecutive naturals, for example, 2421 + ... + 2536.

2²⁸⁷⁵⁰⁶ is an apocalyptic number.

287506 is a deficient number, since it is larger than the sum of its proper divisors (158714).

287506 is a wasteful number, since it uses less digits than its factorization.

287506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 287506 is about 536.1958597378. The cubic root of 287506 is about 66.0007652192. Note that the first 3 decimals are identical.

The spelling of 287506 in words is "two hundred eighty-seven thousand, five hundred six".