128712240 has 140 divisors (see below), whose sum is σ = 448881984. Its totient is φ = 34307712.

The previous prime is 128712203. The next prime is 128712271. The reversal of 128712240 is 42217821.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 27 ways as a sum of consecutive naturals, for example, 57217 + ... + 59423.

Almost surely, 2^128712240 is an apocalyptic number.

128712240 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 128712240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224440992).

128712240 is an abundant number, since it is smaller than the sum of its proper divisors (320169744).

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

128712240 is an equidigital number, since it uses as much as digits as its factorization.

128712240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238 (or 2217 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 128712240 is about 11345.1416914907. The cubic root of 128712240 is about 504.9014479450.

The spelling of 128712240 in words is "one hundred twenty-eight million, seven hundred twelve thousand, two hundred forty".