28493321 has 2 divisors, whose sum is σ = 28493322. Its totient is φ = 28493320.

The previous prime is 28493303. The next prime is 28493323. The reversal of 28493321 is 12339482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 11806096 = 4085^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 28493321 - 2¹⁴ = 28476937 is a prime.

Together with 28493323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28493323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14246660 + 14246661.

It is an arithmetic number, because the mean of its divisors is an integer number (14246661).

Almost surely, 2^28493321 is an apocalyptic number.

It is an amenable number.

28493321 is a deficient number, since it is larger than the sum of its proper divisors (1).

28493321 is an equidigital number, since it uses as much as digits as its factorization.

28493321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 28493321 is about 5337.9135436985. The cubic root of 28493321 is about 305.4318740769.

The spelling of 28493321 in words is "twenty-eight million, four hundred ninety-three thousand, three hundred twenty-one".