686536136 has 128 divisors (see below), whose sum is σ = 1573084800. Its totient is φ = 278403840.

The previous prime is 686536129. The next prime is 686536153. The reversal of 686536136 is 631635686.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10246775 + ... + 10246841.

It is an arithmetic number, because the mean of its divisors is an integer number (12289725).

Almost surely, 2^686536136 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 686536136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786542400).

686536136 is an abundant number, since it is smaller than the sum of its proper divisors (886548664).

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

686536136 is a wasteful number, since it uses less digits than its factorization.

686536136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 146 counting only the distinct ones).

The product of its digits is 466560, while the sum is 44.

The square root of 686536136 is about 26201.8345922571. The cubic root of 686536136 is about 882.1744332715.

The spelling of 686536136 in words is "six hundred eighty-six million, five hundred thirty-six thousand, one hundred thirty-six".