128397260 has 48 divisors (see below), whose sum is σ = 288398880. Its totient is φ = 47846400.

The previous prime is 128397233. The next prime is 128397331. The reversal of 128397260 is 62793821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32471 + ... + 36209.

It is an arithmetic number, because the mean of its divisors is an integer number (6008310).

Almost surely, 2^128397260 is an apocalyptic number.

128397260 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 128397260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144199440).

128397260 is an abundant number, since it is smaller than the sum of its proper divisors (160001620).

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

128397260 is a wasteful number, since it uses less digits than its factorization.

128397260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866 (or 3864 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 128397260 is about 11331.2514754550. The cubic root of 128397260 is about 504.4892525908.

The spelling of 128397260 in words is "one hundred twenty-eight million, three hundred ninety-seven thousand, two hundred sixty".