28213633631281 has 32 divisors (see below), whose sum is σ = 33087186332928. Its totient is φ = 23552873871360.

The previous prime is 28213633631279. The next prime is 28213633631357. The reversal of 28213633631281 is 18213633631282.

It is a cyclic number.

It is not a de Polignac number, because 28213633631281 - 2¹ = 28213633631279 is a prime.

It is a super-2 number, since 2×28213633631281² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28213633661281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1432372425 + ... + 1432392121.

It is an arithmetic number, because the mean of its divisors is an integer number (1033974572904).

Almost surely, 2^{28213633631281} is an apocalyptic number.

It is an amenable number.

28213633631281 is a deficient number, since it is larger than the sum of its proper divisors (4873552701647).

28213633631281 is a wasteful number, since it uses less digits than its factorization.

28213633631281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28041.

The product of its digits is 1492992, while the sum is 49.

Subtracting from 28213633631281 its reverse (18213633631282), we obtain a palindrome (9999999999999).

The spelling of 28213633631281 in words is "twenty-eight trillion, two hundred thirteen billion, six hundred thirty-three million, six hundred thirty-one thousand, two hundred eighty-one".