128936845 has 4 divisors (see below), whose sum is σ = 154724220. Its totient is φ = 103149472.

The previous prime is 128936837. The next prime is 128936849. The reversal of 128936845 is 548639821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18224361 + 110712484 = 4269^2 + 10522^2 .

It is a cyclic number.

It is not a de Polignac number, because 128936845 - 2³ = 128936837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128936795 and 128936804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128936849) 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, 12893680 + ... + 12893689.

It is an arithmetic number, because the mean of its divisors is an integer number (38681055).

Almost surely, 2^128936845 is an apocalyptic number.

It is an amenable number.

128936845 is a deficient number, since it is larger than the sum of its proper divisors (25787375).

128936845 is an equidigital number, since it uses as much as digits as its factorization.

128936845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25787374.

The product of its digits is 414720, while the sum is 46.

The square root of 128936845 is about 11355.0361073842. The cubic root of 128936845 is about 505.1949644227.

The spelling of 128936845 in words is "one hundred twenty-eight million, nine hundred thirty-six thousand, eight hundred forty-five".