128436880 has 160 divisors (see below), whose sum is σ = 357477120. Its totient is φ = 42301440.

The previous prime is 128436877. The next prime is 128436881. The reversal of 128436880 is 88634821.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (128436881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1178266 + ... + 1178374.

It is an arithmetic number, because the mean of its divisors is an integer number (2234232).

Almost surely, 2^128436880 is an apocalyptic number.

128436880 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 128436880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178738560).

128436880 is an abundant number, since it is smaller than the sum of its proper divisors (229040240).

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

128436880 is a wasteful number, since it uses less digits than its factorization.

128436880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 128436880 is about 11332.9996029295. Note that the first 3 decimals coincide. The cubic root of 128436880 is about 504.5411379364.

The spelling of 128436880 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred eighty".