28970549 has 2 divisors, whose sum is σ = 28970550. Its totient is φ = 28970548.

The previous prime is 28970531. The next prime is 28970551. The reversal of 28970549 is 94507982.

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., 19298449 + 9672100 = 4393^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 28970549 - 2²⁴ = 12193333 is a prime.

It is a super-2 number, since 2×28970549² = 1678585418722802, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 28970551, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28970749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14485274 + 14485275.

It is an arithmetic number, because the mean of its divisors is an integer number (14485275).

Almost surely, 2^28970549 is an apocalyptic number.

It is an amenable number.

28970549 is a deficient number, since it is larger than the sum of its proper divisors (1).

28970549 is an equidigital number, since it uses as much as digits as its factorization.

28970549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 28970549 is about 5382.4296558339. The cubic root of 28970549 is about 307.1276441202.

The spelling of 28970549 in words is "twenty-eight million, nine hundred seventy thousand, five hundred forty-nine".