28109388285 has 96 divisors (see below), whose sum is σ = 55521123840. Its totient is φ = 13529851200.

The previous prime is 28109388271. The next prime is 28109388299. The reversal of 28109388285 is 58288390182.

28109388285 is a `hidden beast` number, since 281 + 0 + 9 + 3 + 88 + 285 = 666.

It is an interprime number because it is at equal distance from previous prime (28109388271) and next prime (28109388299).

It is not a de Polignac number, because 28109388285 - 2⁴ = 28109388269 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1850170 + ... + 1865300.

It is an arithmetic number, because the mean of its divisors is an integer number (578345040).

Almost surely, 2^28109388285 is an apocalyptic number.

It is an amenable number.

28109388285 is a deficient number, since it is larger than the sum of its proper divisors (27411735555).

28109388285 is a wasteful number, since it uses less digits than its factorization.

28109388285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15301 (or 15289 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The spelling of 28109388285 in words is "twenty-eight billion, one hundred nine million, three hundred eighty-eight thousand, two hundred eighty-five".