686088704 has 80 divisors (see below), whose sum is σ = 1600397568. Its totient is φ = 287711232.

The previous prime is 686088701. The next prime is 686088731. The reversal of 686088704 is 407880686.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (686088701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166412 + ... + 170484.

Almost surely, 2^686088704 is an apocalyptic number.

686088704 is a gapful number since it is divisible by the number (64) 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 686088704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800198784).

686088704 is an abundant number, since it is smaller than the sum of its proper divisors (914308864).

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

686088704 is an equidigital number, since it uses as much as digits as its factorization.

686088704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145 (or 4129 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 686088704 is about 26193.2950199092. The cubic root of 686088704 is about 881.9827469060.

The spelling of 686088704 in words is "six hundred eighty-six million, eighty-eight thousand, seven hundred four".