688698084 has 48 divisors (see below), whose sum is σ = 1712406528. Its totient is φ = 214675968.

The previous prime is 688698071. The next prime is 688698089. The reversal of 688698084 is 480896886.

It is not an unprimeable number, because it can be changed into a prime (688698089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21277 + ... + 42779.

It is an arithmetic number, because the mean of its divisors is an integer number (35675136).

Almost surely, 2^688698084 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 688698084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856203264).

688698084 is an abundant number, since it is smaller than the sum of its proper divisors (1023708444).

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

688698084 is a wasteful number, since it uses less digits than its factorization.

688698084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21684 (or 21682 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 57.

The square root of 688698084 is about 26243.0578248801. The cubic root of 688698084 is about 883.0994716219.

The spelling of 688698084 in words is "six hundred eighty-eight million, six hundred ninety-eight thousand, eighty-four".