28263407 has 2 divisors, whose sum is σ = 28263408. Its totient is φ = 28263406.

The previous prime is 28263383. The next prime is 28263421. The reversal of 28263407 is 70436282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28263407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28263457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14131703 + 14131704.

It is an arithmetic number, because the mean of its divisors is an integer number (14131704).

Almost surely, 2^28263407 is an apocalyptic number.

28263407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28263407 is an equidigital number, since it uses as much as digits as its factorization.

28263407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 28263407 is about 5316.3339812318. Note that the first 3 decimals coincide. The cubic root of 28263407 is about 304.6081395959.

Adding to 28263407 its reverse (70436282), we get a palindrome (98699689).

The spelling of 28263407 in words is "twenty-eight million, two hundred sixty-three thousand, four hundred seven".