287261 has 8 divisors (see below), whose sum is σ = 325920. Its totient is φ = 250992.

The previous prime is 287257. The next prime is 287269. The reversal of 287261 is 162782.

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

It is a cyclic number.

It is not a de Polignac number, because 287261 - 2² = 287257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 287261.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287261.

It is not an unprimeable number, because it can be changed into a prime (287269) 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, 335 + ... + 828.

It is an arithmetic number, because the mean of its divisors is an integer number (40740).

2²⁸⁷²⁶¹ is an apocalyptic number.

It is an amenable number.

287261 is a deficient number, since it is larger than the sum of its proper divisors (38659).

287261 is a wasteful number, since it uses less digits than its factorization.

287261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195.

The product of its digits is 1344, while the sum is 26.

The square root of 287261 is about 535.9673497518. The cubic root of 287261 is about 65.9820122391.

The spelling of 287261 in words is "two hundred eighty-seven thousand, two hundred sixty-one".