128981448 has 96 divisors (see below), whose sum is σ = 372677760. Its totient is φ = 40158720.

The previous prime is 128981429. The next prime is 128981453. The reversal of 128981448 is 844189821.

128981448 is a `hidden beast` number, since 128 + 9 + 81 + 448 = 666.

It is a Cunningham number, because it is equal to 11357²-1.

It is a nude number because it is divisible by every one of its digits.

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, 204093 + ... + 204723.

It is an arithmetic number, because the mean of its divisors is an integer number (3882060).

Almost surely, 2^128981448 is an apocalyptic number.

128981448 is a gapful number since it is divisible by the number (18) 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 128981448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186338880).

128981448 is an abundant number, since it is smaller than the sum of its proper divisors (243696312).

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

128981448 is a wasteful number, since it uses less digits than its factorization.

128981448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827 (or 820 counting only the distinct ones).

The product of its digits is 147456, while the sum is 45.

The square root of 128981448 is about 11356.9999559743. Note that the first 4 decimals coincide. The cubic root of 128981448 is about 505.2532115778.

The spelling of 128981448 in words is "one hundred twenty-eight million, nine hundred eighty-one thousand, four hundred forty-eight".