268515887 has 4 divisors (see below), whose sum is σ = 269290056. Its totient is φ = 267741720.

The previous prime is 268515881. The next prime is 268515943. The reversal of 268515887 is 788515862.

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

It is a cyclic number.

It is not a de Polignac number, because 268515887 - 2¹² = 268511791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268515881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386564 + ... + 387257.

It is an arithmetic number, because the mean of its divisors is an integer number (67322514).

Almost surely, 2^268515887 is an apocalyptic number.

268515887 is a deficient number, since it is larger than the sum of its proper divisors (774169).

268515887 is an equidigital number, since it uses as much as digits as its factorization.

268515887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774168.

The product of its digits is 1075200, while the sum is 50.

The square root of 268515887 is about 16386.4543754895. The cubic root of 268515887 is about 645.1439992575.

The spelling of 268515887 in words is "two hundred sixty-eight million, five hundred fifteen thousand, eight hundred eighty-seven".