686039886 has 72 divisors (see below), whose sum is σ = 1733406480. Its totient is φ = 195523776.

The previous prime is 686039881. The next prime is 686039891. The reversal of 686039886 is 688930686.

It is an interprime number because it is at equal distance from previous prime (686039881) and next prime (686039891).

686039886 is a modest number, since divided by 39886 gives 686 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686039881) 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 35 ways as a sum of consecutive naturals, for example, 501175 + ... + 502541.

It is an arithmetic number, because the mean of its divisors is an integer number (24075090).

Almost surely, 2^686039886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686039886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (866703240).

686039886 is an abundant number, since it is smaller than the sum of its proper divisors (1047366594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686039886 is a wasteful number, since it uses less digits than its factorization.

686039886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958 (or 1948 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 686039886 is about 26192.3631236282. The cubic root of 686039886 is about 881.9618275241.

The spelling of 686039886 in words is "six hundred eighty-six million, thirty-nine thousand, eight hundred eighty-six".