28506878450 has 12 divisors (see below), whose sum is σ = 53022794010. Its totient is φ = 11402751360.

The previous prime is 28506878441. The next prime is 28506878453. The reversal of 28506878450 is 5487860582.

It can be written as a sum of positive squares in 3 ways, for example, as 13112769121 + 15394109329 = 114511^2 + 124073^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28506878392 and 28506878401.

It is not an unprimeable number, because it can be changed into a prime (28506878453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285068735 + ... + 285068834.

Almost surely, 2^28506878450 is an apocalyptic number.

28506878450 is a deficient number, since it is larger than the sum of its proper divisors (24515915560).

28506878450 is a wasteful number, since it uses less digits than its factorization.

28506878450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570137581 (or 570137576 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 53.

The spelling of 28506878450 in words is "twenty-eight billion, five hundred six million, eight hundred seventy-eight thousand, four hundred fifty".