28236463281 has 24 divisors (see below), whose sum is σ = 43955038400. Its totient is φ = 17363763936.

The previous prime is 28236463273. The next prime is 28236463319. The reversal of 28236463281 is 18236463282.

28236463281 is a `hidden beast` number, since 2 + 8 + 2 + 3 + 6 + 4 + 632 + 8 + 1 = 666.

It is not a de Polignac number, because 28236463281 - 2³ = 28236463273 is a prime.

It is a super-2 number, since 2×28236463281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28236463231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77430 + ... + 249936.

Almost surely, 2^28236463281 is an apocalyptic number.

It is an amenable number.

28236463281 is a deficient number, since it is larger than the sum of its proper divisors (15718575119).

28236463281 is a wasteful number, since it uses less digits than its factorization.

28236463281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173925 (or 173922 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

Subtracting from 28236463281 its reverse (18236463282), we obtain a palindrome (9999999999).

The spelling of 28236463281 in words is "twenty-eight billion, two hundred thirty-six million, four hundred sixty-three thousand, two hundred eighty-one".