686459136 has 216 divisors, whose sum is σ = 2055201120. Its totient is φ = 203202560.

The previous prime is 686459117. The next prime is 686459141. The reversal of 686459136 is 631954686.

It is a super-2 number, since 2×686459136² = 942452290795732992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7712980 + ... + 7713068.

It is an arithmetic number, because the mean of its divisors is an integer number (9514820).

Almost surely, 2^686459136 is an apocalyptic number.

686459136 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 686459136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1027600560).

686459136 is an abundant number, since it is smaller than the sum of its proper divisors (1368741984).

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

686459136 is a wasteful number, since it uses less digits than its factorization.

686459136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 188 counting only the distinct ones).

The product of its digits is 933120, while the sum is 48.

The square root of 686459136 is about 26200.3651882946. The cubic root of 686459136 is about 882.1414512878.

It can be divided in two parts, 6864 and 59136, that multiplied together give a palindrome (405909504).

The spelling of 686459136 in words is "six hundred eighty-six million, four hundred fifty-nine thousand, one hundred thirty-six".