28779349 has 2 divisors, whose sum is σ = 28779350. Its totient is φ = 28779348.

The previous prime is 28779347. The next prime is 28779391. The reversal of 28779349 is 94397782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16459249 + 12320100 = 4057^2 + 3510^2 .

It is a cyclic number.

It is not a de Polignac number, because 28779349 - 2¹ = 28779347 is a prime.

Together with 28779347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28779347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14389674 + 14389675.

It is an arithmetic number, because the mean of its divisors is an integer number (14389675).

Almost surely, 2^28779349 is an apocalyptic number.

It is an amenable number.

28779349 is a deficient number, since it is larger than the sum of its proper divisors (1).

28779349 is an equidigital number, since it uses as much as digits as its factorization.

28779349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The square root of 28779349 is about 5364.6387576425. The cubic root of 28779349 is about 306.4504912906.

The spelling of 28779349 in words is "twenty-eight million, seven hundred seventy-nine thousand, three hundred forty-nine".