128191287040 has 72 divisors (see below), whose sum is σ = 307193847408. Its totient is φ = 51253862400.

The previous prime is 128191287019. The next prime is 128191287043. The reversal of 128191287040 is 40782191821.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128191287043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3042115 + ... + 3083965.

It is an arithmetic number, because the mean of its divisors is an integer number (4266581214).

Almost surely, 2^128191287040 is an apocalyptic number.

128191287040 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 128191287040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153596923704).

128191287040 is an abundant number, since it is smaller than the sum of its proper divisors (179002560368).

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

128191287040 is an equidigital number, since it uses as much as digits as its factorization.

128191287040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44265 (or 44251 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 43.

The spelling of 128191287040 in words is "one hundred twenty-eight billion, one hundred ninety-one million, two hundred eighty-seven thousand, forty".