268681687 has 4 divisors (see below), whose sum is σ = 268794376. Its totient is φ = 268569000.

The previous prime is 268681663. The next prime is 268681697. The reversal of 268681687 is 786186862.

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 268681687 - 2¹⁹ = 268157399 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 (268681627) 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, 52689 + ... + 57562.

It is an arithmetic number, because the mean of its divisors is an integer number (67198594).

Almost surely, 2^268681687 is an apocalyptic number.

268681687 is a deficient number, since it is larger than the sum of its proper divisors (112689).

268681687 is a wasteful number, since it uses less digits than its factorization.

268681687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112688.

The product of its digits is 1548288, while the sum is 52.

The square root of 268681687 is about 16391.5126513693. The cubic root of 268681687 is about 645.2767572208.

The spelling of 268681687 in words is "two hundred sixty-eight million, six hundred eighty-one thousand, six hundred eighty-seven".