28223197 has 2 divisors, whose sum is σ = 28223198. Its totient is φ = 28223196.

The previous prime is 28223191. The next prime is 28223201. The reversal of 28223197 is 79132282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14243076 + 13980121 = 3774^2 + 3739^2 .

It is a cyclic number.

It is not a de Polignac number, because 28223197 - 2¹⁵ = 28190429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28223191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111598 + 14111599.

It is an arithmetic number, because the mean of its divisors is an integer number (14111599).

Almost surely, 2^28223197 is an apocalyptic number.

It is an amenable number.

28223197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28223197 is an equidigital number, since it uses as much as digits as its factorization.

28223197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 28223197 is about 5312.5508938739. The cubic root of 28223197 is about 304.4636169583.

The spelling of 28223197 in words is "twenty-eight million, two hundred twenty-three thousand, one hundred ninety-seven".