28105886 has 4 divisors (see below), whose sum is σ = 42158832. Its totient is φ = 14052942.

The previous prime is 28105873. The next prime is 28105907. The reversal of 28105886 is 68850182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68850182 = 2 ⋅34425091.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7026470 + ... + 7026473.

It is an arithmetic number, because the mean of its divisors is an integer number (10539708).

Almost surely, 2^28105886 is an apocalyptic number.

28105886 is a deficient number, since it is larger than the sum of its proper divisors (14052946).

28105886 is a wasteful number, since it uses less digits than its factorization.

28105886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14052945.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 28105886 is about 5301.4984674147. The cubic root of 28105886 is about 304.0411921906.

It can be divided in two parts, 2810588 and 6, that multiplied together give a triangular number (16863528 = T₅₈₀₇).

The spelling of 28105886 in words is "twenty-eight million, one hundred five thousand, eight hundred eighty-six".