686104823 has 4 divisors (see below), whose sum is σ = 709763640. Its totient is φ = 662446008.

The previous prime is 686104813. The next prime is 686104841. The reversal of 686104823 is 328401686.

It is a happy number.

686104823 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, and also an emirpimes, since its reverse is a distinct semiprime: 328401686 = 2 ⋅164200843.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686104823 is a prime.

It is a super-2 number, since 2×686104823² = 941479656287722658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686104813) 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, 11829365 + ... + 11829422.

It is an arithmetic number, because the mean of its divisors is an integer number (177440910).

Almost surely, 2^686104823 is an apocalyptic number.

686104823 is a deficient number, since it is larger than the sum of its proper divisors (23658817).

686104823 is a wasteful number, since it uses less digits than its factorization.

686104823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23658816.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 686104823 is about 26193.6027113492. The cubic root of 686104823 is about 881.9896539665.

The spelling of 686104823 in words is "six hundred eighty-six million, one hundred four thousand, eight hundred twenty-three".