28949779 has 2 divisors, whose sum is σ = 28949780. Its totient is φ = 28949778.

The previous prime is 28949773. The next prime is 28949857. The reversal of 28949779 is 97794982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28949779 - 2³ = 28949771 is a prime.

It is not a weakly prime, because it can be changed into another prime (28949771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14474889 + 14474890.

It is an arithmetic number, because the mean of its divisors is an integer number (14474890).

Almost surely, 2^28949779 is an apocalyptic number.

28949779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28949779 is an equidigital number, since it uses as much as digits as its factorization.

28949779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 55.

The square root of 28949779 is about 5380.4998838398. The cubic root of 28949779 is about 307.0542297224.

The spelling of 28949779 in words is "twenty-eight million, nine hundred forty-nine thousand, seven hundred seventy-nine".