686882631 has 8 divisors (see below), whose sum is σ = 930857584. Its totient is φ = 450414720.

The previous prime is 686882629. The next prime is 686882633. The reversal of 686882631 is 136288686.

It is an interprime number because it is at equal distance from previous prime (686882629) and next prime (686882633).

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

It is not a de Polignac number, because 686882631 - 2¹ = 686882629 is a prime.

It is a super-2 number, since 2×686882631² = 943615497538964322, 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 (686882633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1876546 + ... + 1876911.

It is an arithmetic number, because the mean of its divisors is an integer number (116357198).

Almost surely, 2^686882631 is an apocalyptic number.

686882631 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

686882631 is a deficient number, since it is larger than the sum of its proper divisors (243974953).

686882631 is a wasteful number, since it uses less digits than its factorization.

686882631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753521.

The product of its digits is 663552, while the sum is 48.

The square root of 686882631 is about 26208.4457952012. The cubic root of 686882631 is about 882.3228195471.

The spelling of 686882631 in words is "six hundred eighty-six million, eight hundred eighty-two thousand, six hundred thirty-one".