28251563 has 2 divisors, whose sum is σ = 28251564. Its totient is φ = 28251562.

The previous prime is 28251547. The next prime is 28251577. The reversal of 28251563 is 36515282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28251563 - 2⁴ = 28251547 is a prime.

It is a super-3 number, since 3×28251563³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28251593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14125781 + 14125782.

It is an arithmetic number, because the mean of its divisors is an integer number (14125782).

Almost surely, 2^28251563 is an apocalyptic number.

28251563 is a deficient number, since it is larger than the sum of its proper divisors (1).

28251563 is an equidigital number, since it uses as much as digits as its factorization.

28251563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 28251563 is about 5315.2199390053. The cubic root of 28251563 is about 304.5655841829.

The spelling of 28251563 in words is "twenty-eight million, two hundred fifty-one thousand, five hundred sixty-three".