128573280 has 144 divisors (see below), whose sum is σ = 478702224. Its totient is φ = 31165440.

The previous prime is 128573273. The next prime is 128573293. The reversal of 128573280 is 82375821.

128573280 is a `hidden beast` number, since 1 + 2 + 8 + 573 + 2 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11782 + ... + 19898.

It is an arithmetic number, because the mean of its divisors is an integer number (3324321).

Almost surely, 2^128573280 is an apocalyptic number.

128573280 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 128573280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239351112).

128573280 is an abundant number, since it is smaller than the sum of its proper divisors (350128944).

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

128573280 is a wasteful number, since it uses less digits than its factorization.

128573280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8149 (or 8138 counting only the distinct ones).

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

The square root of 128573280 is about 11339.0158303091. The cubic root of 128573280 is about 504.7196823532.

The spelling of 128573280 in words is "one hundred twenty-eight million, five hundred seventy-three thousand, two hundred eighty".