28105261085 has 48 divisors (see below), whose sum is σ = 38392386480. Its totient is φ = 19724390400.

The previous prime is 28105261043. The next prime is 28105261099. The reversal of 28105261085 is 58016250182.

It can be written as a sum of positive squares in 8 ways, for example, as 1177107481 + 26928153604 = 34309^2 + 164098^2 .

It is not a de Polignac number, because 28105261085 - 2⁶ = 28105261021 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1948781 + ... + 1963149.

It is an arithmetic number, because the mean of its divisors is an integer number (799841385).

Almost surely, 2^28105261085 is an apocalyptic number.

It is an amenable number.

28105261085 is a deficient number, since it is larger than the sum of its proper divisors (10287125395).

28105261085 is a wasteful number, since it uses less digits than its factorization.

28105261085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14510 (or 14499 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 28105261085 in words is "twenty-eight billion, one hundred five million, two hundred sixty-one thousand, eighty-five".