28125188686 has 16 divisors (see below), whose sum is σ = 48656947680. Its totient is φ = 11943067680.

The previous prime is 28125188677. The next prime is 28125188701. The reversal of 28125188686 is 68688152182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9213805 + ... + 9216856.

It is an arithmetic number, because the mean of its divisors is an integer number (3041059230).

Almost surely, 2^28125188686 is an apocalyptic number.

28125188686 is a deficient number, since it is larger than the sum of its proper divisors (20531758994).

28125188686 is a wasteful number, since it uses less digits than its factorization.

28125188686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18430779.

The product of its digits is 2949120, while the sum is 55.

It can be divided in two parts, 28125 and 188686, that added together give a triangular number (216811 = T₆₅₈).

The spelling of 28125188686 in words is "twenty-eight billion, one hundred twenty-five million, one hundred eighty-eight thousand, six hundred eighty-six".