686245600 has 72 divisors (see below), whose sum is σ = 1714343400. Its totient is φ = 268101120.

The previous prime is 686245597. The next prime is 686245621. The reversal of 686245600 is 6542686.

It is a self number, because there is not a number n which added to its sum of digits gives 686245600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24426 + ... + 44374.

It is an arithmetic number, because the mean of its divisors is an integer number (23810325).

Almost surely, 2^686245600 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 686245600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (857171700).

686245600 is an abundant number, since it is smaller than the sum of its proper divisors (1028097800).

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

686245600 is a wasteful number, since it uses less digits than its factorization.

686245600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20012 (or 19999 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 686245600 is about 26196.2898136358. The cubic root of 686245600 is about 882.0499729160.

The spelling of 686245600 in words is "six hundred eighty-six million, two hundred forty-five thousand, six hundred".