2857287 has 4 divisors (see below), whose sum is σ = 3809720. Its totient is φ = 1904856.

The previous prime is 2857259. The next prime is 2857297. The reversal of 2857287 is 7827582.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2857287 - 2⁶ = 2857223 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 8⁶ + 5⁹ + 7² + 2¹⁸ + 8⁶ + 7⁶ .

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476212 + ... + 476217.

It is an arithmetic number, because the mean of its divisors is an integer number (952430).

2^2857287 is an apocalyptic number.

2857287 is a deficient number, since it is larger than the sum of its proper divisors (952433).

2857287 is an equidigital number, since it uses as much as digits as its factorization.

2857287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952432.

The product of its digits is 62720, while the sum is 39.

The square root of 2857287 is about 1690.3511469514. The cubic root of 2857287 is about 141.9007274140.

The spelling of 2857287 in words is "two million, eight hundred fifty-seven thousand, two hundred eighty-seven".