28292928381 has 24 divisors (see below), whose sum is σ = 41571897120. Its totient is φ = 18537055200.

The previous prime is 28292928347. The next prime is 28292928401. The reversal of 28292928381 is 18382929282.

28292928381 is a `hidden beast` number, since 282 + 9 + 2 + 9 + 283 + 81 = 666.

It is not a de Polignac number, because 28292928381 - 2²⁷ = 28158710653 is a prime.

It is a super-2 number, since 2×28292928381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28292926381) 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, 3107646 + ... + 3116736.

It is an arithmetic number, because the mean of its divisors is an integer number (1732162380).

Almost surely, 2^28292928381 is an apocalyptic number.

It is an amenable number.

28292928381 is a deficient number, since it is larger than the sum of its proper divisors (13278968739).

28292928381 is a wasteful number, since it uses less digits than its factorization.

28292928381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15017 (or 15014 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

Subtracting from 28292928381 its reverse (18382929282), we obtain a palindrome (9909999099).

The spelling of 28292928381 in words is "twenty-eight billion, two hundred ninety-two million, nine hundred twenty-eight thousand, three hundred eighty-one".