128247878990 has 64 divisors (see below), whose sum is σ = 287894131200. Its totient is φ = 39961434240.

The previous prime is 128247878989. The next prime is 128247878999. The reversal of 128247878990 is 99878742821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128247878999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2758961 + ... + 2805059.

It is an arithmetic number, because the mean of its divisors is an integer number (4498345800).

Almost surely, 2^128247878990 is an apocalyptic number.

128247878990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128247878990 is an abundant number, since it is smaller than the sum of its proper divisors (159646252210).

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

128247878990 is a wasteful number, since it uses less digits than its factorization.

128247878990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49737.

The product of its (nonzero) digits is 32514048, while the sum is 65.

The spelling of 128247878990 in words is "one hundred twenty-eight billion, two hundred forty-seven million, eight hundred seventy-eight thousand, nine hundred ninety".