128122731979 has 8 divisors (see below), whose sum is σ = 141211184688. Its totient is φ = 115274434560.

The previous prime is 128122731911. The next prime is 128122732007. The reversal of 128122731979 is 979137221821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128122731979 - 2³¹ = 125975248331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128122731479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60037702 + ... + 60039835.

It is an arithmetic number, because the mean of its divisors is an integer number (17651398086).

Almost surely, 2^128122731979 is an apocalyptic number.

128122731979 is a deficient number, since it is larger than the sum of its proper divisors (13088452709).

128122731979 is a wasteful number, since it uses less digits than its factorization.

128122731979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120077645.

The product of its digits is 762048, while the sum is 52.

The spelling of 128122731979 in words is "one hundred twenty-eight billion, one hundred twenty-two million, seven hundred thirty-one thousand, nine hundred seventy-nine".