28777249 has 2 divisors, whose sum is σ = 28777250. Its totient is φ = 28777248.

The previous prime is 28777247. The next prime is 28777283. The reversal of 28777249 is 94277782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20976400 + 7800849 = 4580^2 + 2793^2 .

It is a cyclic number.

It is not a de Polignac number, because 28777249 - 2¹ = 28777247 is a prime.

Together with 28777247, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28777199 and 28777208.

It is not a weakly prime, because it can be changed into another prime (28777241) 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, 14388624 + 14388625.

It is an arithmetic number, because the mean of its divisors is an integer number (14388625).

Almost surely, 2^28777249 is an apocalyptic number.

It is an amenable number.

28777249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28777249 is an equidigital number, since it uses as much as digits as its factorization.

28777249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 46.

The square root of 28777249 is about 5364.4430279387. The cubic root of 28777249 is about 306.4430373151.

The spelling of 28777249 in words is "twenty-eight million, seven hundred seventy-seven thousand, two hundred forty-nine".