28367321 has 2 divisors, whose sum is σ = 28367322. Its totient is φ = 28367320.

The previous prime is 28367309. The next prime is 28367351. The reversal of 28367321 is 12376382.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27825625 + 541696 = 5275^2 + 736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28367321 is a prime.

It is not a weakly prime, because it can be changed into another prime (28367351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14183660 + 14183661.

It is an arithmetic number, because the mean of its divisors is an integer number (14183661).

Almost surely, 2^28367321 is an apocalyptic number.

It is an amenable number.

28367321 is a deficient number, since it is larger than the sum of its proper divisors (1).

28367321 is an equidigital number, since it uses as much as digits as its factorization.

28367321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 28367321 is about 5326.0981027390. The cubic root of 28367321 is about 304.9809931719.

The spelling of 28367321 in words is "twenty-eight million, three hundred sixty-seven thousand, three hundred twenty-one".