688780080 has 120 divisors (see below), whose sum is σ = 2413783008. Its totient is φ = 175684608.

The previous prime is 688780069. The next prime is 688780093. The reversal of 688780080 is 80087886.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 4237 + ... + 37356.

Almost surely, 2^688780080 is an apocalyptic number.

688780080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 688780080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1206891504).

688780080 is an abundant number, since it is smaller than the sum of its proper divisors (1725002928).

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

688780080 is a wasteful number, since it uses less digits than its factorization.

688780080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41635 (or 41626 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 688780080 is about 26244.6200201108. The cubic root of 688780080 is about 883.1345173371.

The spelling of 688780080 in words is "six hundred eighty-eight million, seven hundred eighty thousand, eighty".