686860847 has 4 divisors (see below), whose sum is σ = 687008256. Its totient is φ = 686713440.

The previous prime is 686860841. The next prime is 686860861. The reversal of 686860847 is 748068686.

It is a happy number.

686860847 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 cyclic number.

It is not a de Polignac number, because 686860847 - 2⁸ = 686860591 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 (686860841) 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, 66479 + ... + 76112.

It is an arithmetic number, because the mean of its divisors is an integer number (171752064).

Almost surely, 2^686860847 is an apocalyptic number.

686860847 is a deficient number, since it is larger than the sum of its proper divisors (147409).

686860847 is a wasteful number, since it uses less digits than its factorization.

686860847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147408.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The square root of 686860847 is about 26208.0302006847. The cubic root of 686860847 is about 882.3134920325.

The spelling of 686860847 in words is "six hundred eighty-six million, eight hundred sixty thousand, eight hundred forty-seven".