128139436326 has 48 divisors (see below), whose sum is σ = 281738483712. Its totient is φ = 38824133040.

The previous prime is 128139436319. The next prime is 128139436357. The reversal of 128139436326 is 623634931821.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7663291 + ... + 7679993.

It is an arithmetic number, because the mean of its divisors is an integer number (5869551744).

Almost surely, 2^128139436326 is an apocalyptic number.

128139436326 is an abundant number, since it is smaller than the sum of its proper divisors (153599047386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128139436326 is a wasteful number, since it uses less digits than its factorization.

128139436326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27297 (or 27286 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 48.

It can be divided in two parts, 128139 and 436326, that added together give a palindrome (564465).

The spelling of 128139436326 in words is "one hundred twenty-eight billion, one hundred thirty-nine million, four hundred thirty-six thousand, three hundred twenty-six".