128470844987 has 4 divisors (see below), whose sum is σ = 128610640080. Its totient is φ = 128331049896.

The previous prime is 128470844981. The next prime is 128470845023. The reversal of 128470844987 is 789448074821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128470844987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128470844981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69896168 + ... + 69898005.

It is an arithmetic number, because the mean of its divisors is an integer number (32152660020).

Almost surely, 2^128470844987 is an apocalyptic number.

128470844987 is a deficient number, since it is larger than the sum of its proper divisors (139795093).

128470844987 is an equidigital number, since it uses as much as digits as its factorization.

128470844987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139795092.

The product of its (nonzero) digits is 28901376, while the sum is 62.

The spelling of 128470844987 in words is "one hundred twenty-eight billion, four hundred seventy million, eight hundred forty-four thousand, nine hundred eighty-seven".