128543779 has 16 divisors (see below), whose sum is σ = 158748352. Its totient is φ = 101357568.

The previous prime is 128543773. The next prime is 128543801. The reversal of 128543779 is 977345821.

It is not a de Polignac number, because 128543779 - 2³ = 128543771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128543771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26227 + ... + 30739.

It is an arithmetic number, because the mean of its divisors is an integer number (9921772).

Almost surely, 2^128543779 is an apocalyptic number.

128543779 is a deficient number, since it is larger than the sum of its proper divisors (30204573).

128543779 is a wasteful number, since it uses less digits than its factorization.

128543779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4846.

The product of its digits is 423360, while the sum is 46.

The square root of 128543779 is about 11337.7148932225. The cubic root of 128543779 is about 504.6810769387.

The spelling of 128543779 in words is "one hundred twenty-eight million, five hundred forty-three thousand, seven hundred seventy-nine".