28309277 has 2 divisors, whose sum is σ = 28309278. Its totient is φ = 28309276.

The previous prime is 28309273. The next prime is 28309289. The reversal of 28309277 is 77290382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21724921 + 6584356 = 4661^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 28309277 - 2² = 28309273 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28309277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28309271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14154638 + 14154639.

It is an arithmetic number, because the mean of its divisors is an integer number (14154639).

Almost surely, 2^28309277 is an apocalyptic number.

It is an amenable number.

28309277 is a deficient number, since it is larger than the sum of its proper divisors (1).

28309277 is an equidigital number, since it uses as much as digits as its factorization.

28309277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 28309277 is about 5320.6462953292. The cubic root of 28309277 is about 304.7728381095.

The spelling of 28309277 in words is "twenty-eight million, three hundred nine thousand, two hundred seventy-seven".