688868154 has 48 divisors (see below), whose sum is σ = 1618999200. Its totient is φ = 210424608.

The previous prime is 688868113. The next prime is 688868207. The reversal of 688868154 is 451868886.

688868154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 688868154.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21937 + ... + 43115.

It is an arithmetic number, because the mean of its divisors is an integer number (33729150).

Almost surely, 2^688868154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688868154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809499600).

688868154 is an abundant number, since it is smaller than the sum of its proper divisors (930131046).

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

688868154 is a wasteful number, since it uses less digits than its factorization.

688868154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21339 (or 21336 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The square root of 688868154 is about 26246.2979103720. The cubic root of 688868154 is about 883.1721577377.

The spelling of 688868154 in words is "six hundred eighty-eight million, eight hundred sixty-eight thousand, one hundred fifty-four".