28212323 has 2 divisors, whose sum is σ = 28212324. Its totient is φ = 28212322.

The previous prime is 28212311. The next prime is 28212341. The reversal of 28212323 is 32321282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28212323 - 2⁴ = 28212307 is a prime.

It is not a weakly prime, because it can be changed into another prime (28212523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106161 + 14106162.

It is an arithmetic number, because the mean of its divisors is an integer number (14106162).

Almost surely, 2^28212323 is an apocalyptic number.

28212323 is a deficient number, since it is larger than the sum of its proper divisors (1).

28212323 is an equidigital number, since it uses as much as digits as its factorization.

28212323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 28212323 is about 5311.5273697873. The cubic root of 28212323 is about 304.4245100887.

The spelling of 28212323 in words is "twenty-eight million, two hundred twelve thousand, three hundred twenty-three".