686258656 has 96 divisors (see below), whose sum is σ = 1463132160. Its totient is φ = 316185600.

The previous prime is 686258641. The next prime is 686258717. The reversal of 686258656 is 656852686.

It is a happy number.

Its product of digits (4147200) is a multiple of the sum of its prime divisors (480).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1911405 + ... + 1911763.

It is an arithmetic number, because the mean of its divisors is an integer number (15240960).

Almost surely, 2^686258656 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 686258656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731566080).

686258656 is an abundant number, since it is smaller than the sum of its proper divisors (776873504).

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

686258656 is a wasteful number, since it uses less digits than its factorization.

686258656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 480 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 52.

The square root of 686258656 is about 26196.5390080446. The cubic root of 686258656 is about 882.0555666234.

The spelling of 686258656 in words is "six hundred eighty-six million, two hundred fifty-eight thousand, six hundred fifty-six".