128107840 has 56 divisors (see below), whose sum is σ = 348642432. Its totient is φ = 43921920.

The previous prime is 128107831. The next prime is 128107849. The reversal of 128107840 is 48701821.

It is an interprime number because it is at equal distance from previous prime (128107831) and next prime (128107849).

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128107849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26356 + ... + 30835.

Almost surely, 2^128107840 is an apocalyptic number.

128107840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128107840 is an abundant number, since it is smaller than the sum of its proper divisors (220534592).

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

128107840 is an equidigital number, since it uses as much as digits as its factorization.

128107840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57215 (or 57205 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 128107840 is about 11318.4733952950. The cubic root of 128107840 is about 504.1099113612.

The spelling of 128107840 in words is "one hundred twenty-eight million, one hundred seven thousand, eight hundred forty".