128885680 has 200 divisors, whose sum is σ = 387613584. Its totient is φ = 39513600.

The previous prime is 128885623. The next prime is 128885707. The reversal of 128885680 is 86588821.

It is a super-2 number, since 2×128885680² = 33223037018124800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128885680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2112850 + ... + 2112910.

Almost surely, 2^128885680 is an apocalyptic number.

128885680 is a gapful number since it is divisible by the number (10) 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 128885680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193806792).

128885680 is an abundant number, since it is smaller than the sum of its proper divisors (258727904).

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

128885680 is an equidigital number, since it uses as much as digits as its factorization.

128885680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 46.

The square root of 128885680 is about 11352.7829187385. The cubic root of 128885680 is about 505.1281313925.

It can be divided in two parts, 1288 and 85680, that added together give a palindrome (86968).

The spelling of 128885680 in words is "one hundred twenty-eight million, eight hundred eighty-five thousand, six hundred eighty".