287345 has 8 divisors (see below), whose sum is σ = 348840. Its totient is φ = 227200.

The previous prime is 287341. The next prime is 287347. The reversal of 287345 is 543782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50176 + 237169 = 224^2 + 487^2 .

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

It is not a de Polignac number, because 287345 - 2² = 287341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221 + ... + 789.

It is an arithmetic number, because the mean of its divisors is an integer number (43605).

2²⁸⁷³⁴⁵ is an apocalyptic number.

It is an amenable number.

287345 is a deficient number, since it is larger than the sum of its proper divisors (61495).

287345 is a wasteful number, since it uses less digits than its factorization.

287345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675.

The product of its digits is 6720, while the sum is 29.

The square root of 287345 is about 536.0457070064. The cubic root of 287345 is about 65.9884430331.

The spelling of 287345 in words is "two hundred eighty-seven thousand, three hundred forty-five".