128842867 has 4 divisors (see below), whose sum is σ = 129010320. Its totient is φ = 128675416.

The previous prime is 128842829. The next prime is 128842871. The reversal of 128842867 is 768248821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768248821 = 523 ⋅1468927.

It is a cyclic number.

It is not a de Polignac number, because 128842867 - 2⁷ = 128842739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128842817) 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 3 ways as a sum of consecutive naturals, for example, 82567 + ... + 84112.

It is an arithmetic number, because the mean of its divisors is an integer number (32252580).

Almost surely, 2^128842867 is an apocalyptic number.

128842867 is a deficient number, since it is larger than the sum of its proper divisors (167453).

128842867 is an equidigital number, since it uses as much as digits as its factorization.

128842867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167452.

The product of its digits is 344064, while the sum is 46.

The square root of 128842867 is about 11350.8971892093. The cubic root of 128842867 is about 505.0721943645.

It can be divided in two parts, 12884 and 2867, that added together give a palindrome (15751).

The spelling of 128842867 in words is "one hundred twenty-eight million, eight hundred forty-two thousand, eight hundred sixty-seven".