868257686 has 4 divisors (see below), whose sum is σ = 1302386532. Its totient is φ = 434128842.

The previous prime is 868257683. The next prime is 868257737. The reversal of 868257686 is 686752868.

868257686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868257683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217064420 + ... + 217064423.

It is an arithmetic number, because the mean of its divisors is an integer number (325596633).

Almost surely, 2^868257686 is an apocalyptic number.

868257686 is a deficient number, since it is larger than the sum of its proper divisors (434128846).

868257686 is a wasteful number, since it uses less digits than its factorization.

868257686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434128845.

The product of its digits is 7741440, while the sum is 56.

The square root of 868257686 is about 29466.2126171654. The cubic root of 868257686 is about 954.0025718264.

The spelling of 868257686 in words is "eight hundred sixty-eight million, two hundred fifty-seven thousand, six hundred eighty-six".