128183440 has 80 divisors (see below), whose sum is σ = 371583360. Its totient is φ = 39951360.

The previous prime is 128183431. The next prime is 128183449. The reversal of 128183440 is 44381821.

It is an interprime number because it is at equal distance from previous prime (128183431) and next prime (128183449).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (128183449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4245 + ... + 16564.

It is an arithmetic number, because the mean of its divisors is an integer number (4644792).

Almost surely, 2^128183440 is an apocalyptic number.

128183440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128183440 is an abundant number, since it is smaller than the sum of its proper divisors (243399920).

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

128183440 is a wasteful number, since it uses less digits than its factorization.

128183440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20840 (or 20834 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 128183440 is about 11321.8125757319. The cubic root of 128183440 is about 504.2090549551.

The spelling of 128183440 in words is "one hundred twenty-eight million, one hundred eighty-three thousand, four hundred forty".