28133157877 has 6 divisors (see below), whose sum is σ = 30923223254. Its totient is φ = 25575597960.

The previous prime is 28133157859. The next prime is 28133157907. The reversal of 28133157877 is 77875133182.

It can be written as a sum of positive squares in only one way, i.e., 25052241841 + 3080916036 = 158279^2 + 55506^2 .

It is not a de Polignac number, because 28133157877 - 2⁷ = 28133157749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28133157827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116252598 + ... + 116252839.

Almost surely, 2^28133157877 is an apocalyptic number.

It is an amenable number.

28133157877 is a deficient number, since it is larger than the sum of its proper divisors (2790065377).

28133157877 is a wasteful number, since it uses less digits than its factorization.

28133157877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232505459 (or 232505448 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 52.

The spelling of 28133157877 in words is "twenty-eight billion, one hundred thirty-three million, one hundred fifty-seven thousand, eight hundred seventy-seven".