28639079 has 6 divisors (see below), whose sum is σ = 33314904. Its totient is φ = 24547740.

The previous prime is 28639063. The next prime is 28639097. The reversal of 28639079 is 97093682.

It is not a de Polignac number, because 28639079 - 2⁴ = 28639063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28639979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292187 + ... + 292284.

It is an arithmetic number, because the mean of its divisors is an integer number (5552484).

Almost surely, 2^28639079 is an apocalyptic number.

28639079 is a deficient number, since it is larger than the sum of its proper divisors (4675825).

28639079 is an equidigital number, since it uses as much as digits as its factorization.

28639079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584485 (or 584478 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 28639079 is about 5351.5492149470. The cubic root of 28639079 is about 305.9518022540.

The spelling of 28639079 in words is "twenty-eight million, six hundred thirty-nine thousand, seventy-nine".