128798280 has 288 divisors, whose sum is σ = 475324200. Its totient is φ = 30191616.

The previous prime is 128798237. The next prime is 128798281. The reversal of 128798280 is 82897821.

It is a happy number.

128798280 is a `hidden beast` number, since 1 + 287 + 98 + 280 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 66564 + 128731716 = 258^2 + 11346^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128798281) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1764324 + ... + 1764396.

Almost surely, 2^128798280 is an apocalyptic number.

128798280 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 128798280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237662100).

128798280 is an abundant number, since it is smaller than the sum of its proper divisors (346525920).

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

128798280 is a wasteful number, since it uses less digits than its factorization.

128798280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 128798280 is about 11348.9329894929. The cubic root of 128798280 is about 505.0139263552.

The spelling of 128798280 in words is "one hundred twenty-eight million, seven hundred ninety-eight thousand, two hundred eighty".