287128 has 16 divisors (see below), whose sum is σ = 567000. Its totient is φ = 135936.

The previous prime is 287117. The next prime is 287137. The reversal of 287128 is 821782.

It is a d-powerful number, because it can be written as 2¹³ + 8² + 1 + 7³ + 2¹⁴ + 8⁶ .

It is a junction number, because it is equal to n+sod(n) for n = 287096 and 287105.

It is a congruent number.

It is an unprimeable number.

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, 793 + ... + 1096.

2²⁸⁷¹²⁸ is an apocalyptic number.

It is an amenable number.

287128 is a deficient number, since it is larger than the sum of its proper divisors (279872).

287128 is a wasteful number, since it uses less digits than its factorization.

287128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914 (or 1910 counting only the distinct ones).

The product of its digits is 1792, while the sum is 28.

The square root of 287128 is about 535.8432606649. The cubic root of 287128 is about 65.9718275844.

The spelling of 287128 in words is "two hundred eighty-seven thousand, one hundred twenty-eight".