287668 has 6 divisors (see below), whose sum is σ = 503426. Its totient is φ = 143832.

The previous prime is 287629. The next prime is 287669. The reversal of 287668 is 866782.

It can be written as a sum of positive squares in only one way, i.e., 219024 + 68644 = 468^2 + 262^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287669) by changing a digit.

287668 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, 35955 + ... + 35962.

2²⁸⁷⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

287668 is a deficient number, since it is larger than the sum of its proper divisors (215758).

287668 is a wasteful number, since it uses less digits than its factorization.

287668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71921 (or 71919 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 287668 is about 536.3469026665. The cubic root of 287668 is about 66.0131592983.

The spelling of 287668 in words is "two hundred eighty-seven thousand, six hundred sixty-eight".