28243258663 has 4 divisors (see below), whose sum is σ = 28262253600. Its totient is φ = 28224263728.

The previous prime is 28243258661. The next prime is 28243258679. The reversal of 28243258663 is 36685234282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36685234282 = 2 ⋅18342617141.

It is a cyclic number.

It is not a de Polignac number, because 28243258663 - 2¹ = 28243258661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243258661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9495238 + ... + 9498211.

It is an arithmetic number, because the mean of its divisors is an integer number (7065563400).

Almost surely, 2^28243258663 is an apocalyptic number.

28243258663 is a deficient number, since it is larger than the sum of its proper divisors (18994937).

28243258663 is a wasteful number, since it uses less digits than its factorization.

28243258663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18994936.

The product of its digits is 3317760, while the sum is 49.

The spelling of 28243258663 in words is "twenty-eight billion, two hundred forty-three million, two hundred fifty-eight thousand, six hundred sixty-three".