686776356 has 216 divisors, whose sum is σ = 2197628160. Its totient is φ = 179625600.

The previous prime is 686776339. The next prime is 686776357. The reversal of 686776356 is 653677686.

Its product of digits (7620480) is a multiple of the sum of its prime factors (735).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686776357) 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 71 ways as a sum of consecutive naturals, for example, 1038666 + ... + 1039326.

Almost surely, 2^686776356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686776356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1098814080).

686776356 is an abundant number, since it is smaller than the sum of its proper divisors (1510851804).

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

686776356 is a wasteful number, since it uses less digits than its factorization.

686776356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 723 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The square root of 686776356 is about 26206.4182214968. The cubic root of 686776356 is about 882.2773126489.

The spelling of 686776356 in words is "six hundred eighty-six million, seven hundred seventy-six thousand, three hundred fifty-six".