28216493 has 2 divisors, whose sum is σ = 28216494. Its totient is φ = 28216492.

The previous prime is 28216477. The next prime is 28216499. The reversal of 28216493 is 39461282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27899524 + 316969 = 5282^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 28216493 - 2⁴ = 28216477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28216499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14108246 + 14108247.

It is an arithmetic number, because the mean of its divisors is an integer number (14108247).

Almost surely, 2^28216493 is an apocalyptic number.

It is an amenable number.

28216493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28216493 is an equidigital number, since it uses as much as digits as its factorization.

28216493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 28216493 is about 5311.9198977394. The cubic root of 28216493 is about 304.4395081171.

The spelling of 28216493 in words is "twenty-eight million, two hundred sixteen thousand, four hundred ninety-three".