28978979 has 2 divisors, whose sum is σ = 28978980. Its totient is φ = 28978978.

The previous prime is 28978973. The next prime is 28978981. The reversal of 28978979 is 97987982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28978979 - 2⁸ = 28978723 is a prime.

It is a Sophie Germain prime.

Together with 28978981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28978973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14489489 + 14489490.

It is an arithmetic number, because the mean of its divisors is an integer number (14489490).

Almost surely, 2^28978979 is an apocalyptic number.

28978979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28978979 is an equidigital number, since it uses as much as digits as its factorization.

28978979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 59.

The square root of 28978979 is about 5383.2127024668. The cubic root of 28978979 is about 307.1574310940.

The spelling of 28978979 in words is "twenty-eight million, nine hundred seventy-eight thousand, nine hundred seventy-nine".