28969979 has 2 divisors, whose sum is σ = 28969980. Its totient is φ = 28969978.

The previous prime is 28969973. The next prime is 28969987. The reversal of 28969979 is 97996982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28969979 - 2¹⁶ = 28904443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28969973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14484989 + 14484990.

It is an arithmetic number, because the mean of its divisors is an integer number (14484990).

Almost surely, 2^28969979 is an apocalyptic number.

28969979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28969979 is an equidigital number, since it uses as much as digits as its factorization.

28969979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 28969979 is about 5382.3767055085. The cubic root of 28969979 is about 307.1256298458.

The spelling of 28969979 in words is "twenty-eight million, nine hundred sixty-nine thousand, nine hundred seventy-nine".