128819880 has 384 divisors, whose sum is σ = 528353280. Its totient is φ = 26542080.

The previous prime is 128819851. The next prime is 128819891. The reversal of 128819880 is 88918821.

It is a super-2 number, since 2×128819880² = 33189122966428800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1327992 + ... + 1328088.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^128819880 is an apocalyptic number.

128819880 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 128819880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264176640).

128819880 is an abundant number, since it is smaller than the sum of its proper divisors (399533400).

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

128819880 is a wasteful number, since it uses less digits than its factorization.

128819880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The square root of 128819880 is about 11349.8845809109. The cubic root of 128819880 is about 505.0421557463.

The spelling of 128819880 in words is "one hundred twenty-eight million, eight hundred nineteen thousand, eight hundred eighty".