128436879 has 16 divisors (see below), whose sum is σ = 177867360. Its totient is φ = 82368000.

The previous prime is 128436877. The next prime is 128436881. The reversal of 128436879 is 978634821.

It is an interprime number because it is at equal distance from previous prime (128436877) and next prime (128436881).

It is not a de Polignac number, because 128436879 - 2¹ = 128436877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128436871) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3379 + ... + 16379.

It is an arithmetic number, because the mean of its divisors is an integer number (11116710).

Almost surely, 2^128436879 is an apocalyptic number.

128436879 is a deficient number, since it is larger than the sum of its proper divisors (49430481).

128436879 is a wasteful number, since it uses less digits than its factorization.

128436879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13130.

The product of its digits is 580608, while the sum is 48.

The square root of 128436879 is about 11332.9995588105. Note that the first 3 decimals coincide. The cubic root of 128436879 is about 504.5411366270.

The spelling of 128436879 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred seventy-nine".