28506878452 has 24 divisors (see below), whose sum is σ = 53729764200. Its totient is φ = 13155732096.

The previous prime is 28506878441. The next prime is 28506878453. The reversal of 28506878452 is 25487860582.

It can be written as a sum of positive squares in 4 ways, for example, as 1254151396 + 27252727056 = 35414^2 + 165084^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28506878393 and 28506878402.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 692874 + ... + 732862.

It is an arithmetic number, because the mean of its divisors is an integer number (2238740175).

Almost surely, 2^28506878452 is an apocalyptic number.

It is an amenable number.

28506878452 is a deficient number, since it is larger than the sum of its proper divisors (25222885748).

28506878452 is a wasteful number, since it uses less digits than its factorization.

28506878452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53715 (or 53713 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 55.

The spelling of 28506878452 in words is "twenty-eight billion, five hundred six million, eight hundred seventy-eight thousand, four hundred fifty-two".