128019280 has 20 divisors (see below), whose sum is σ = 297645012. Its totient is φ = 51207680.

The previous prime is 128019257. The next prime is 128019289. The reversal of 128019280 is 82910821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 102090816 + 25928464 = 10104^2 + 5092^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128019289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800041 + ... + 800200.

Almost surely, 2^128019280 is an apocalyptic number.

128019280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128019280 is an abundant number, since it is smaller than the sum of its proper divisors (169625732).

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

128019280 is a wasteful number, since it uses less digits than its factorization.

128019280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600254 (or 1600248 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 128019280 is about 11314.5605305730. The cubic root of 128019280 is about 503.9937221020.

The spelling of 128019280 in words is "one hundred twenty-eight million, nineteen thousand, two hundred eighty".