128511240 has 128 divisors (see below), whose sum is σ = 452995200. Its totient is φ = 28753920.

The previous prime is 128511217. The next prime is 128511241. The reversal of 128511240 is 42115821.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 128511240.

It is not an unprimeable number, because it can be changed into a prime (128511241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13416 + ... + 20904.

It is an arithmetic number, because the mean of its divisors is an integer number (3539025).

Almost surely, 2^128511240 is an apocalyptic number.

128511240 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 128511240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226497600).

128511240 is an abundant number, since it is smaller than the sum of its proper divisors (324483960).

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

128511240 is a wasteful number, since it uses less digits than its factorization.

128511240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527 (or 7523 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 128511240 is about 11336.2798130604. The cubic root of 128511240 is about 504.6384891046.

The spelling of 128511240 in words is "one hundred twenty-eight million, five hundred eleven thousand, two hundred forty".