128394280 has 64 divisors (see below), whose sum is σ = 344528640. Its totient is φ = 42104832.

The previous prime is 128394263. The next prime is 128394289. The reversal of 128394280 is 82493821.

It is a super-2 number, since 2×128394280² = 32970182273436800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128394289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3529 + ... + 16408.

It is an arithmetic number, because the mean of its divisors is an integer number (5383260).

Almost surely, 2^128394280 is an apocalyptic number.

128394280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128394280 is an abundant number, since it is smaller than the sum of its proper divisors (216134360).

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

128394280 is a wasteful number, since it uses less digits than its factorization.

128394280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19978 (or 19974 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 128394280 is about 11331.1199799490. The cubic root of 128394280 is about 504.4853496269.

The spelling of 128394280 in words is "one hundred twenty-eight million, three hundred ninety-four thousand, two hundred eighty".