28128555963 has 80 divisors (see below), whose sum is σ = 46796403456. Its totient is φ = 16756346880.

The previous prime is 28128555953. The next prime is 28128555971. The reversal of 28128555963 is 36955582182.

It is a happy number.

28128555963 is a `hidden beast` number, since 2 + 8 + 1 + 2 + 85 + 559 + 6 + 3 = 666.

It is not a de Polignac number, because 28128555963 - 2¹³ = 28128547771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28128555943) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2256195 + ... + 2268627.

Almost surely, 2^28128555963 is an apocalyptic number.

28128555963 is a deficient number, since it is larger than the sum of its proper divisors (18667847493).

28128555963 is a wasteful number, since it uses less digits than its factorization.

28128555963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12546 (or 12537 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The spelling of 28128555963 in words is "twenty-eight billion, one hundred twenty-eight million, five hundred fifty-five thousand, nine hundred sixty-three".