688868280 has 64 divisors (see below), whose sum is σ = 2296231200. Its totient is φ = 183697920.

The previous prime is 688868251. The next prime is 688868281. The reversal of 688868280 is 82868886.

688868280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688868281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317841 + ... + 320000.

Almost surely, 2^688868280 is an apocalyptic number.

688868280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

688868280 is an abundant number, since it is smaller than the sum of its proper divisors (1607362920).

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

688868280 is a wasteful number, since it uses less digits than its factorization.

688868280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637861 (or 637851 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 54.

The square root of 688868280 is about 26246.3003107105. The cubic root of 688868280 is about 883.1722115843.

The spelling of 688868280 in words is "six hundred eighty-eight million, eight hundred sixty-eight thousand, two hundred eighty".