128135796 has 12 divisors (see below), whose sum is σ = 298983552. Its totient is φ = 42711928.

The previous prime is 128135663. The next prime is 128135797. The reversal of 128135796 is 697531821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128135797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5338980 + ... + 5339003.

It is an arithmetic number, because the mean of its divisors is an integer number (24915296).

Almost surely, 2^128135796 is an apocalyptic number.

It is an amenable number.

128135796 is an abundant number, since it is smaller than the sum of its proper divisors (170847756).

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

128135796 is a wasteful number, since it uses less digits than its factorization.

128135796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10677990 (or 10677988 counting only the distinct ones).

The product of its digits is 90720, while the sum is 42.

The square root of 128135796 is about 11319.7083001286. The cubic root of 128135796 is about 504.1465780520.

It can be divided in two parts, 1281 and 35796, that multiplied together give a triangular number (45854676 = T₉₅₇₆).

The spelling of 128135796 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, seven hundred ninety-six".