28332229 has 2 divisors, whose sum is σ = 28332230. Its totient is φ = 28332228.

The previous prime is 28332197. The next prime is 28332257. The reversal of 28332229 is 92223382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 10227204 = 4255^2 + 3198^2 .

It is a cyclic number.

It is not a de Polignac number, because 28332229 - 2⁵ = 28332197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28332229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28332259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14166114 + 14166115.

It is an arithmetic number, because the mean of its divisors is an integer number (14166115).

Almost surely, 2^28332229 is an apocalyptic number.

It is an amenable number.

28332229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28332229 is an equidigital number, since it uses as much as digits as its factorization.

28332229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 28332229 is about 5322.8027391591. The cubic root of 28332229 is about 304.8551816298.

It can be divided in two parts, 28332 and 229, that added together give a 4-th power (28561 = 13⁴).

The spelling of 28332229 in words is "twenty-eight million, three hundred thirty-two thousand, two hundred twenty-nine".