128887638040 has 48 divisors (see below), whose sum is σ = 337343670000. Its totient is φ = 44190046656.

The previous prime is 128887638029. The next prime is 128887638041. The reversal of 128887638040 is 40836788821.

It is a super-2 number, since 2×128887638040² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128887638041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32877540 + ... + 32881459.

It is an arithmetic number, because the mean of its divisors is an integer number (7027993125).

Almost surely, 2^128887638040 is an apocalyptic number.

128887638040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128887638040 is an abundant number, since it is smaller than the sum of its proper divisors (208456031960).

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

128887638040 is a wasteful number, since it uses less digits than its factorization.

128887638040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65759024 (or 65759013 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 55.

The spelling of 128887638040 in words is "one hundred twenty-eight billion, eight hundred eighty-seven million, six hundred thirty-eight thousand, forty".