268987 has 4 divisors (see below), whose sum is σ = 277696. Its totient is φ = 260280.

The previous prime is 268979. The next prime is 268993. The reversal of 268987 is 789862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789862 = 2 ⋅394931.

It is a cyclic number.

It is not a de Polignac number, because 268987 - 2³ = 268979 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (268927) 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, 4308 + ... + 4369.

It is an arithmetic number, because the mean of its divisors is an integer number (69424).

2²⁶⁸⁹⁸⁷ is an apocalyptic number.

268987 is a deficient number, since it is larger than the sum of its proper divisors (8709).

268987 is an equidigital number, since it uses as much as digits as its factorization.

268987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8708.

The product of its digits is 48384, while the sum is 40.

The square root of 268987 is about 518.6395665585. The cubic root of 268987 is about 64.5521082030.

The spelling of 268987 in words is "two hundred sixty-eight thousand, nine hundred eighty-seven".