128081880 has 48 divisors (see below), whose sum is σ = 416267280. Its totient is φ = 34155072.

The previous prime is 128081843. The next prime is 128081881. The reversal of 128081880 is 88180821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128081881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 177532 + ... + 178251.

It is an arithmetic number, because the mean of its divisors is an integer number (8672235).

Almost surely, 2^128081880 is an apocalyptic number.

128081880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128081880 is an abundant number, since it is smaller than the sum of its proper divisors (288185400).

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

128081880 is a wasteful number, since it uses less digits than its factorization.

128081880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355800 (or 355793 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 128081880 is about 11317.3265394262. The cubic root of 128081880 is about 504.0758578185.

The spelling of 128081880 in words is "one hundred twenty-eight million, eighty-one thousand, eight hundred eighty".