128381040 has 60 divisors (see below), whose sum is σ = 431148744. Its totient is φ = 34234752.

The previous prime is 128381023. The next prime is 128381053. The reversal of 128381040 is 40183821.

It is a tau number, because it is divible by the number of its divisors (60).

It is a junction number, because it is equal to n+sod(n) for n = 128380995 and 128381013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88434 + ... + 89873.

Almost surely, 2^128381040 is an apocalyptic number.

128381040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128381040 is an abundant number, since it is smaller than the sum of its proper divisors (302767704).

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

128381040 is a wasteful number, since it uses less digits than its factorization.

128381040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178326 (or 178317 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 128381040 is about 11330.5357331417. The cubic root of 128381040 is about 504.4680082115.

The spelling of 128381040 in words is "one hundred twenty-eight million, three hundred eighty-one thousand, forty".