686812698 has 144 divisors (see below), whose sum is σ = 1784659968. Its totient is φ = 189604800.

The previous prime is 686812681. The next prime is 686812747. The reversal of 686812698 is 896218686.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3595783 + ... + 3595973.

It is an arithmetic number, because the mean of its divisors is an integer number (12393472).

Almost surely, 2^686812698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686812698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892329984).

686812698 is an abundant number, since it is smaller than the sum of its proper divisors (1097847270).

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

686812698 is a wasteful number, since it uses less digits than its factorization.

686812698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 347 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 686812698 is about 26207.1115920851. Note that the first 3 decimals coincide. The cubic root of 686812698 is about 882.2928748020.

The spelling of 686812698 in words is "six hundred eighty-six million, eight hundred twelve thousand, six hundred ninety-eight".