128489280 has 56 divisors (see below), whose sum is σ = 407956512. Its totient is φ = 34263552.

The previous prime is 128489261. The next prime is 128489287. The reversal of 128489280 is 82984821.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128489287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65962 + ... + 67881.

Almost surely, 2^128489280 is an apocalyptic number.

128489280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128489280 is an abundant number, since it is smaller than the sum of its proper divisors (279467232).

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

128489280 is a wasteful number, since it uses less digits than its factorization.

128489280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133863 (or 133853 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 128489280 is about 11335.3111999627. The cubic root of 128489280 is about 504.6097432597.

The spelling of 128489280 in words is "one hundred twenty-eight million, four hundred eighty-nine thousand, two hundred eighty".