686555136 has 152 divisors (see below), whose sum is σ = 2055205040. Its totient is φ = 226492416.

The previous prime is 686555119. The next prime is 686555141. The reversal of 686555136 is 631555686.

686555136 is a `hidden beast` number, since 6 + 8 + 65 + 551 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 686555091 and 686555100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7077840 + ... + 7077936.

Almost surely, 2^686555136 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 686555136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027602520).

686555136 is an abundant number, since it is smaller than the sum of its proper divisors (1368649904).

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

686555136 is an frugal number, since it uses more digits than its factorization.

686555136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 102 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 686555136 is about 26202.1971597803. The cubic root of 686555136 is about 882.1825713038.

It can be divided in two parts, 6865 and 55136, that added together give a square (62001 = 249²).

The spelling of 686555136 in words is "six hundred eighty-six million, five hundred fifty-five thousand, one hundred thirty-six".