28216049 has 2 divisors, whose sum is σ = 28216050. Its totient is φ = 28216048.

The previous prime is 28216037. The next prime is 28216079. The reversal of 28216049 is 94061282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26061025 + 2155024 = 5105^2 + 1468^2 .

It is a cyclic number.

It is not a de Polignac number, because 28216049 - 2¹⁶ = 28150513 is a prime.

It is a super-2 number, since 2×28216049² = 1592290842340802, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28216079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14108024 + 14108025.

It is an arithmetic number, because the mean of its divisors is an integer number (14108025).

Almost surely, 2^28216049 is an apocalyptic number.

It is an amenable number.

28216049 is a deficient number, since it is larger than the sum of its proper divisors (1).

28216049 is an equidigital number, since it uses as much as digits as its factorization.

28216049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28216049 is about 5311.8781047761. The cubic root of 28216049 is about 304.4379112750.

The spelling of 28216049 in words is "twenty-eight million, two hundred sixteen thousand, forty-nine".