28133506887 has 16 divisors (see below), whose sum is σ = 38533036032. Its totient is φ = 18245031840.

The previous prime is 28133506879. The next prime is 28133506901. The reversal of 28133506887 is 78860533182.

It is not a de Polignac number, because 28133506887 - 2³ = 28133506879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28133506847) 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, 584118 + ... + 630444.

It is an arithmetic number, because the mean of its divisors is an integer number (2408314752).

Almost surely, 2^28133506887 is an apocalyptic number.

28133506887 is a deficient number, since it is larger than the sum of its proper divisors (10399529145).

28133506887 is a wasteful number, since it uses less digits than its factorization.

28133506887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51838.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 28133506887 in words is "twenty-eight billion, one hundred thirty-three million, five hundred six thousand, eight hundred eighty-seven".