686828117 has 4 divisors (see below), whose sum is σ = 689564736. Its totient is φ = 684091500.

The previous prime is 686828063. The next prime is 686828119. The reversal of 686828117 is 711828686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686828117 - 2⁸ = 686827861 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 (686828119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1367933 + ... + 1368434.

It is an arithmetic number, because the mean of its divisors is an integer number (172391184).

Almost surely, 2^686828117 is an apocalyptic number.

It is an amenable number.

686828117 is a deficient number, since it is larger than the sum of its proper divisors (2736619).

686828117 is a wasteful number, since it uses less digits than its factorization.

686828117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736618.

The product of its digits is 258048, while the sum is 47.

The square root of 686828117 is about 26207.4057663096. The cubic root of 686828117 is about 882.2994772678.

The spelling of 686828117 in words is "six hundred eighty-six million, eight hundred twenty-eight thousand, one hundred seventeen".