128938395270 has 96 divisors (see below), whose sum is σ = 332133488640. Its totient is φ = 32021651520.

The previous prime is 128938395259. The next prime is 128938395281. The reversal of 128938395270 is 72593839821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128938395259) and next prime (128938395281).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 128938395270.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 538075 + ... + 739865.

It is an arithmetic number, because the mean of its divisors is an integer number (3459723840).

Almost surely, 2^128938395270 is an apocalyptic number.

128938395270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128938395270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166066744320).

128938395270 is an abundant number, since it is smaller than the sum of its proper divisors (203195093370).

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

128938395270 is a wasteful number, since it uses less digits than its factorization.

128938395270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201898 (or 201879 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 128938395270 in words is "one hundred twenty-eight billion, nine hundred thirty-eight million, three hundred ninety-five thousand, two hundred seventy".