128513636 has 6 divisors (see below), whose sum is σ = 224898870. Its totient is φ = 64256816.

The previous prime is 128513579. The next prime is 128513647. The reversal of 128513636 is 636315821.

It can be written as a sum of positive squares in only one way, i.e., 75864100 + 52649536 = 8710^2 + 7256^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128513596 and 128513605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16064201 + ... + 16064208.

It is an arithmetic number, because the mean of its divisors is an integer number (37483145).

Almost surely, 2^128513636 is an apocalyptic number.

It is an amenable number.

128513636 is a deficient number, since it is larger than the sum of its proper divisors (96385234).

128513636 is a wasteful number, since it uses less digits than its factorization.

128513636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32128413 (or 32128411 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 128513636 is about 11336.3854909755. The cubic root of 128513636 is about 504.6416252928.

The spelling of 128513636 in words is "one hundred twenty-eight million, five hundred thirteen thousand, six hundred thirty-six".