686683900 has 144 divisors (see below), whose sum is σ = 1763887104. Its totient is φ = 227185920.

The previous prime is 686683897. The next prime is 686683901. The reversal of 686683900 is 9386686.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686683901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3079189 + ... + 3079411.

It is an arithmetic number, because the mean of its divisors is an integer number (12249216).

Almost surely, 2^686683900 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 686683900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881943552).

686683900 is an abundant number, since it is smaller than the sum of its proper divisors (1077203204).

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

686683900 is a wasteful number, since it uses less digits than its factorization.

686683900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 373 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 686683900 is about 26204.6541667697. The cubic root of 686683900 is about 882.2377192202.

The spelling of 686683900 in words is "six hundred eighty-six million, six hundred eighty-three thousand, nine hundred".