28243903 has 2 divisors, whose sum is σ = 28243904. Its totient is φ = 28243902.

The previous prime is 28243879. The next prime is 28243907. The reversal of 28243903 is 30934282.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28243903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28243907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121951 + 14121952.

It is an arithmetic number, because the mean of its divisors is an integer number (14121952).

Almost surely, 2^28243903 is an apocalyptic number.

28243903 is a deficient number, since it is larger than the sum of its proper divisors (1).

28243903 is an equidigital number, since it uses as much as digits as its factorization.

28243903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 28243903 is about 5314.4993179038. The cubic root of 28243903 is about 304.5380555200.

The spelling of 28243903 in words is "twenty-eight million, two hundred forty-three thousand, nine hundred three".