686220136 has 32 divisors (see below), whose sum is σ = 1471320000. Its totient is φ = 293924736.

The previous prime is 686220121. The next prime is 686220137. The reversal of 686220136 is 631022686.

It is a happy number.

686220136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (686220137) 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, 168735 + ... + 172753.

It is an arithmetic number, because the mean of its divisors is an integer number (45978750).

Almost surely, 2^686220136 is an apocalyptic number.

It is an amenable number.

686220136 is an abundant number, since it is smaller than the sum of its proper divisors (785099864).

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

686220136 is a wasteful number, since it uses less digits than its factorization.

686220136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7081 (or 7077 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 686220136 is about 26195.8037861028. The cubic root of 686220136 is about 882.0390629258.

The spelling of 686220136 in words is "six hundred eighty-six million, two hundred twenty thousand, one hundred thirty-six".