28149474889 has 2 divisors, whose sum is σ = 28149474890. Its totient is φ = 28149474888.

The previous prime is 28149474839. The next prime is 28149474907. The reversal of 28149474889 is 98847494182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22121505289 + 6027969600 = 148733^2 + 77640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28149474889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28149474889.

It is not a weakly prime, because it can be changed into another prime (28149474839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14074737444 + 14074737445.

It is an arithmetic number, because the mean of its divisors is an integer number (14074737445).

Almost surely, 2^28149474889 is an apocalyptic number.

It is an amenable number.

28149474889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28149474889 is an equidigital number, since it uses as much as digits as its factorization.

28149474889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37158912, while the sum is 64.

The spelling of 28149474889 in words is "twenty-eight billion, one hundred forty-nine million, four hundred seventy-four thousand, eight hundred eighty-nine".