128420027128440 has 48 divisors (see below), whose sum is σ = 417365088168600. Its totient is φ = 34245340567488.

The previous prime is 128420027128439. The next prime is 128420027128507. The reversal of 128420027128440 is 44821720024821.

128420027128440 is a `hidden beast` number, since 1 + 2 + 84 + 2 + 0 + 0 + 2 + 7 + 128 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178361148430 + ... + 178361149149.

Almost surely, 2^{128420027128440} is an apocalyptic number.

128420027128440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128420027128440 is an abundant number, since it is smaller than the sum of its proper divisors (288945061040160).

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

128420027128440 is a wasteful number, since it uses less digits than its factorization.

128420027128440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356722297596 (or 356722297589 counting only the distinct ones).

The product of its (nonzero) digits is 458752, while the sum is 45.

The spelling of 128420027128440 in words is "one hundred twenty-eight trillion, four hundred twenty billion, twenty-seven million, one hundred twenty-eight thousand, four hundred forty".