686779236 has 240 divisors, whose sum is σ = 2152653888. Its totient is φ = 188956800.

The previous prime is 686779229. The next prime is 686779253. The reversal of 686779236 is 632977686.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 11258646 + ... + 11258706.

Almost surely, 2^686779236 is an apocalyptic number.

686779236 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686779236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076326944).

686779236 is an abundant number, since it is smaller than the sum of its proper divisors (1465874652).

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

686779236 is a wasteful number, since it uses less digits than its factorization.

686779236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 90 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 686779236 is about 26206.4731698105. The cubic root of 686779236 is about 882.2785459252.

The spelling of 686779236 in words is "six hundred eighty-six million, seven hundred seventy-nine thousand, two hundred thirty-six".