128969280 has 448 divisors, whose sum is σ = 526694400. Its totient is φ = 29399040.

The previous prime is 128969249. The next prime is 128969297. The reversal of 128969280 is 82969821.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2185891 + ... + 2185949.

Almost surely, 2^128969280 is an apocalyptic number.

128969280 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 128969280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263347200).

128969280 is an abundant number, since it is smaller than the sum of its proper divisors (397725120).

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

128969280 is a wasteful number, since it uses less digits than its factorization.

128969280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 128969280 is about 11356.4642384855. The cubic root of 128969280 is about 505.2373226922.

The spelling of 128969280 in words is "one hundred twenty-eight million, nine hundred sixty-nine thousand, two hundred eighty".