28105512 has 32 divisors (see below), whose sum is σ = 70720800. Its totient is φ = 9307584.

The previous prime is 28105501. The next prime is 28105513. The reversal of 28105512 is 21550182.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (28105513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39 + ... + 7497.

It is an arithmetic number, because the mean of its divisors is an integer number (2210025).

Almost surely, 2^28105512 is an apocalyptic number.

It is an amenable number.

28105512 is an abundant number, since it is smaller than the sum of its proper divisors (42615288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28105512 is a wasteful number, since it uses less digits than its factorization.

28105512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7625 (or 7621 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 28105512 is about 5301.4631942512. The cubic root of 28105512 is about 304.0398435773.

Adding to 28105512 its reverse (21550182), we get a palindrome (49655694).

The spelling of 28105512 in words is "twenty-eight million, one hundred five thousand, five hundred twelve".