28105775800 has 48 divisors (see below), whose sum is σ = 65477115000. Its totient is φ = 11219740800.

The previous prime is 28105775699. The next prime is 28105775809. The reversal of 28105775800 is 857750182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28105775809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41011 + ... + 240610.

Almost surely, 2^28105775800 is an apocalyptic number.

28105775800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28105775800 is an abundant number, since it is smaller than the sum of its proper divisors (37371339200).

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

28105775800 is a wasteful number, since it uses less digits than its factorization.

28105775800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282136 (or 282127 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 43.

The spelling of 28105775800 in words is "twenty-eight billion, one hundred five million, seven hundred seventy-five thousand, eight hundred".