28236493 has 2 divisors, whose sum is σ = 28236494. Its totient is φ = 28236492.

The previous prime is 28236491. The next prime is 28236539. The reversal of 28236493 is 39463282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22071204 + 6165289 = 4698^2 + 2483^2 .

It is a cyclic number.

It is not a de Polignac number, because 28236493 - 2¹ = 28236491 is a prime.

Together with 28236491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28236491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14118246 + 14118247.

It is an arithmetic number, because the mean of its divisors is an integer number (14118247).

Almost surely, 2^28236493 is an apocalyptic number.

It is an amenable number.

28236493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28236493 is an equidigital number, since it uses as much as digits as its factorization.

28236493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 28236493 is about 5313.8021227742. The cubic root of 28236493 is about 304.5114205755.

It can be divided in two parts, 2823 and 6493, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 28236493 in words is "twenty-eight million, two hundred thirty-six thousand, four hundred ninety-three".