688481682 has 128 divisors (see below), whose sum is σ = 1712947200. Its totient is φ = 180138816.

The previous prime is 688481641. The next prime is 688481687. The reversal of 688481682 is 286184886.

It is not an unprimeable number, because it can be changed into a prime (688481687) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4223733 + ... + 4223895.

It is an arithmetic number, because the mean of its divisors is an integer number (13382400).

Almost surely, 2^688481682 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688481682, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856473600).

688481682 is an abundant number, since it is smaller than the sum of its proper divisors (1024465518).

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

688481682 is a wasteful number, since it uses less digits than its factorization.

688481682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its digits is 1179648, while the sum is 51.

The square root of 688481682 is about 26238.9344676951. The cubic root of 688481682 is about 883.0069663979.

The spelling of 688481682 in words is "six hundred eighty-eight million, four hundred eighty-one thousand, six hundred eighty-two".