28236491 has 2 divisors, whose sum is σ = 28236492. Its totient is φ = 28236490.

The previous prime is 28236463. The next prime is 28236493. The reversal of 28236491 is 19463282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28236491 is a prime.

Together with 28236493, 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 (28236493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14118245 + 14118246.

It is an arithmetic number, because the mean of its divisors is an integer number (14118246).

Almost surely, 2^28236491 is an apocalyptic number.

28236491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28236491 is an equidigital number, since it uses as much as digits as its factorization.

28236491 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 28236491 is about 5313.8019345851. The cubic root of 28236491 is about 304.5114133860.

The spelling of 28236491 in words is "twenty-eight million, two hundred thirty-six thousand, four hundred ninety-one".