686786331 has 64 divisors (see below), whose sum is σ = 1210245120. Its totient is φ = 335612160.

The previous prime is 686786329. The next prime is 686786339. The reversal of 686786331 is 133687686.

It is not a de Polignac number, because 686786331 - 2¹ = 686786329 is a prime.

It is a super-2 number, since 2×686786331² = 943350928896883122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686786339) 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 63 ways as a sum of consecutive naturals, for example, 732495 + ... + 733431.

It is an arithmetic number, because the mean of its divisors is an integer number (18910080).

Almost surely, 2^686786331 is an apocalyptic number.

686786331 is a deficient number, since it is larger than the sum of its proper divisors (523458789).

686786331 is a wasteful number, since it uses less digits than its factorization.

686786331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144.

The product of its digits is 870912, while the sum is 48.

The square root of 686786331 is about 26206.6085367794. The cubic root of 686786331 is about 882.2815841382.

The spelling of 686786331 in words is "six hundred eighty-six million, seven hundred eighty-six thousand, three hundred thirty-one".