686383687 has 32 divisors (see below), whose sum is σ = 855982080. Its totient is φ = 542277120.

The previous prime is 686383667. The next prime is 686383699. The reversal of 686383687 is 786383686.

It is a happy number.

It is not a de Polignac number, because 686383687 - 2¹⁹ = 685859399 is a prime.

It is a super-2 number, since 2×686383687² = 942245131559427938, 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 (686383627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121978 + ... + 127480.

It is an arithmetic number, because the mean of its divisors is an integer number (26749440).

Almost surely, 2^686383687 is an apocalyptic number.

686383687 is a deficient number, since it is larger than the sum of its proper divisors (169598393).

686383687 is a wasteful number, since it uses less digits than its factorization.

686383687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5583.

The product of its digits is 6967296, while the sum is 55.

The square root of 686383687 is about 26198.9253023860. The cubic root of 686383687 is about 882.1091312630.

Subtracting 686383687 from its reverse (786383686), we obtain a palindrome (99999999).

The spelling of 686383687 in words is "six hundred eighty-six million, three hundred eighty-three thousand, six hundred eighty-seven".