28136979 has 24 divisors (see below), whose sum is σ = 44058560. Its totient is φ = 17302896.

The previous prime is 28136971. The next prime is 28137013. The reversal of 28136979 is 97963182.

28136979 is a `hidden beast` number, since 281 + 369 + 7 + 9 = 666.

It is not a de Polignac number, because 28136979 - 2³ = 28136971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28136971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19062 + ... + 20484.

Almost surely, 2^28136979 is an apocalyptic number.

28136979 is a deficient number, since it is larger than the sum of its proper divisors (15921581).

28136979 is a wasteful number, since it uses less digits than its factorization.

28136979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468 (or 1439 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 28136979 is about 5304.4301296181. The cubic root of 28136979 is about 304.1532691749.

The spelling of 28136979 in words is "twenty-eight million, one hundred thirty-six thousand, nine hundred seventy-nine".