28922209 has 2 divisors, whose sum is σ = 28922210. Its totient is φ = 28922208.

The previous prime is 28922203. The next prime is 28922233. The reversal of 28922209 is 90222982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 13712209 = 3900^2 + 3703^2 .

It is a cyclic number.

It is not a de Polignac number, because 28922209 - 2⁵ = 28922177 is a prime.

It is equal to p_1795183 and since 28922209 and 1795183 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28922203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14461104 + 14461105.

It is an arithmetic number, because the mean of its divisors is an integer number (14461105).

Almost surely, 2^28922209 is an apocalyptic number.

It is an amenable number.

28922209 is a deficient number, since it is larger than the sum of its proper divisors (1).

28922209 is an equidigital number, since it uses as much as digits as its factorization.

28922209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28922209 is about 5377.9372439626. The cubic root of 28922209 is about 306.9567255368.

The spelling of 28922209 in words is "twenty-eight million, nine hundred twenty-two thousand, two hundred nine".