28705049 has 2 divisors, whose sum is σ = 28705050. Its totient is φ = 28705048.

The previous prime is 28705021. The next prime is 28705069. The reversal of 28705049 is 94050782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17280649 + 11424400 = 4157^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 28705049 - 2¹² = 28700953 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28705009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14352524 + 14352525.

It is an arithmetic number, because the mean of its divisors is an integer number (14352525).

Almost surely, 2^28705049 is an apocalyptic number.

It is an amenable number.

28705049 is a deficient number, since it is larger than the sum of its proper divisors (1).

28705049 is an equidigital number, since it uses as much as digits as its factorization.

28705049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28705049 is about 5357.7093052908. The cubic root of 28705049 is about 306.1865416760.

The spelling of 28705049 in words is "twenty-eight million, seven hundred five thousand, forty-nine".