128365633 has 8 divisors (see below), whose sum is σ = 141194016. Its totient is φ = 116694820.

The previous prime is 128365619. The next prime is 128365639. The reversal of 128365633 is 336563821.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-128365633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128365592 and 128365601.

It is not an unprimeable number, because it can be changed into a prime (128365639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46891 + ... + 49552.

It is an arithmetic number, because the mean of its divisors is an integer number (17649252).

Almost surely, 2^128365633 is an apocalyptic number.

It is an amenable number.

128365633 is a deficient number, since it is larger than the sum of its proper divisors (12828383).

128365633 is an frugal number, since it uses more digits than its factorization.

128365633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96476 (or 96454 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 128365633 is about 11329.8558243254. The cubic root of 128365633 is about 504.4478270136.

It can be divided in two parts, 1283656 and 33, that added together give a square (1283689 = 1133²).

The spelling of 128365633 in words is "one hundred twenty-eight million, three hundred sixty-five thousand, six hundred thirty-three".