686844028707 has 4 divisors (see below), whose sum is σ = 915792038280. Its totient is φ = 457896019136.

The previous prime is 686844028681. The next prime is 686844028709. The reversal of 686844028707 is 707820448686.

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 686844028707 - 2⁷ = 686844028579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686844028709) 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, 114474004782 + ... + 114474004787.

It is an arithmetic number, because the mean of its divisors is an integer number (228948009570).

Almost surely, 2^686844028707 is an apocalyptic number.

686844028707 is a deficient number, since it is larger than the sum of its proper divisors (228948009573).

686844028707 is a wasteful number, since it uses less digits than its factorization.

686844028707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228948009572.

The product of its (nonzero) digits is 28901376, while the sum is 60.

The spelling of 686844028707 in words is "six hundred eighty-six billion, eight hundred forty-four million, twenty-eight thousand, seven hundred seven".