128339280 has 60 divisors (see below), whose sum is σ = 431008500. Its totient is φ = 34223616.

The previous prime is 128339261. The next prime is 128339291. The reversal of 128339280 is 82933821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 91470096 + 36869184 = 9564^2 + 6072^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 88405 + ... + 89844.

It is an arithmetic number, because the mean of its divisors is an integer number (7183475).

Almost surely, 2^128339280 is an apocalyptic number.

128339280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128339280 is an abundant number, since it is smaller than the sum of its proper divisors (302669220).

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

128339280 is a wasteful number, since it uses less digits than its factorization.

128339280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178268 (or 178259 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 128339280 is about 11328.6927754265. The cubic root of 128339280 is about 504.4133042131.

The spelling of 128339280 in words is "one hundred twenty-eight million, three hundred thirty-nine thousand, two hundred eighty".