686740623 has 8 divisors (see below), whose sum is σ = 930665136. Its totient is φ = 450321600.

The previous prime is 686740597. The next prime is 686740631. The reversal of 686740623 is 326047686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 686740623 - 2⁹ = 686740111 is a prime.

It is a super-2 number, since 2×686740623² = 943225366556856258, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686740633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1876158 + ... + 1876523.

It is an arithmetic number, because the mean of its divisors is an integer number (116333142).

Almost surely, 2^686740623 is an apocalyptic number.

686740623 is a deficient number, since it is larger than the sum of its proper divisors (243924513).

686740623 is a wasteful number, since it uses less digits than its factorization.

686740623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752745.

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 686740623 is about 26205.7364521587. The cubic root of 686740623 is about 882.2620107427.

The spelling of 686740623 in words is "six hundred eighty-six million, seven hundred forty thousand, six hundred twenty-three".