268729687 has 4 divisors (see below), whose sum is σ = 269605336. Its totient is φ = 267854040.

The previous prime is 268729679. The next prime is 268729729. The reversal of 268729687 is 786927862.

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 268729687 - 2³ = 268729679 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 (268729627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437364 + ... + 437977.

It is an arithmetic number, because the mean of its divisors is an integer number (67401334).

Almost surely, 2^268729687 is an apocalyptic number.

268729687 is a deficient number, since it is larger than the sum of its proper divisors (875649).

268729687 is an equidigital number, since it uses as much as digits as its factorization.

268729687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875648.

The product of its digits is 4064256, while the sum is 55.

The square root of 268729687 is about 16392.9767583560. The cubic root of 268729687 is about 645.3151811769.

The spelling of 268729687 in words is "two hundred sixty-eight million, seven hundred twenty-nine thousand, six hundred eighty-seven".