128975400 has 144 divisors (see below), whose sum is σ = 439108800. Its totient is φ = 33920640.

The previous prime is 128975369. The next prime is 128975423. The reversal of 128975400 is 4579821.

128975400 is a `hidden beast` number, since 1 + 28 + 97 + 540 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 141747 + ... + 142653.

Almost surely, 2^128975400 is an apocalyptic number.

128975400 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 128975400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219554400).

128975400 is an abundant number, since it is smaller than the sum of its proper divisors (310133400).

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

128975400 is a wasteful number, since it uses less digits than its factorization.

128975400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008 (or 996 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 128975400 is about 11356.7336853516. The cubic root of 128975400 is about 505.2453142684.

The spelling of 128975400 in words is "one hundred twenty-eight million, nine hundred seventy-five thousand, four hundred".