128998840747 has 12 divisors (see below), whose sum is σ = 150927284016. Its totient is φ = 109931292240.

The previous prime is 128998840741. The next prime is 128998840759. The reversal of 128998840747 is 747048899821.

It is not a de Polignac number, because 128998840747 - 2³ = 128998840739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128998840741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7600279 + ... + 7617232.

It is an arithmetic number, because the mean of its divisors is an integer number (12577273668).

Almost surely, 2^128998840747 is an apocalyptic number.

128998840747 is a deficient number, since it is larger than the sum of its proper divisors (21928443269).

128998840747 is a wasteful number, since it uses less digits than its factorization.

128998840747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15217698 (or 15217691 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 67.

The spelling of 128998840747 in words is "one hundred twenty-eight billion, nine hundred ninety-eight million, eight hundred forty thousand, seven hundred forty-seven".