28324785105 has 40 divisors (see below), whose sum is σ = 50798716584. Its totient is φ = 15099436800.

The previous prime is 28324785091. The next prime is 28324785109. The reversal of 28324785105 is 50158742382.

It can be written as a sum of positive squares in 4 ways, for example, as 12631961664 + 15692823441 = 112392^2 + 125271^2 .

It is not a de Polignac number, because 28324785105 - 2⁸ = 28324784849 is a prime.

It is a super-2 number, since 2×28324785105² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28324785109) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 908475 + ... + 939135.

Almost surely, 2^28324785105 is an apocalyptic number.

It is an amenable number.

28324785105 is a deficient number, since it is larger than the sum of its proper divisors (22473931479).

28324785105 is a wasteful number, since it uses less digits than its factorization.

28324785105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32959 (or 32950 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 28324785105 in words is "twenty-eight billion, three hundred twenty-four million, seven hundred eighty-five thousand, one hundred five".