128375280 has 200 divisors, whose sum is σ = 486669744. Its totient is φ = 31104000.

The previous prime is 128375263. The next prime is 128375281. The reversal of 128375280 is 82573821.

128375280 is a `hidden beast` number, since 1 + 2 + 8 + 375 + 280 = 666.

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 (128375281) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70380 + ... + 72180.

Almost surely, 2^128375280 is an apocalyptic number.

128375280 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 128375280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243334872).

128375280 is an abundant number, since it is smaller than the sum of its proper divisors (358294464).

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

128375280 is a wasteful number, since it uses less digits than its factorization.

128375280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837 (or 1822 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 128375280 is about 11330.2815498998. The cubic root of 128375280 is about 504.4604635378.

The spelling of 128375280 in words is "one hundred twenty-eight million, three hundred seventy-five thousand, two hundred eighty".