28506878443 has 16 divisors (see below), whose sum is σ = 29166804000. Its totient is φ = 27851765760.

The previous prime is 28506878441. The next prime is 28506878453. The reversal of 28506878443 is 34487860582.

It is a cyclic number.

It is not a de Polignac number, because 28506878443 - 2¹ = 28506878441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28506878441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17585173 + ... + 17586793.

It is an arithmetic number, because the mean of its divisors is an integer number (1822925250).

Almost surely, 2^28506878443 is an apocalyptic number.

28506878443 is a deficient number, since it is larger than the sum of its proper divisors (659925557).

28506878443 is a wasteful number, since it uses less digits than its factorization.

28506878443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862.

The product of its (nonzero) digits is 10321920, while the sum is 55.

The spelling of 28506878443 in words is "twenty-eight billion, five hundred six million, eight hundred seventy-eight thousand, four hundred forty-three".