28725165226 has 16 divisors (see below), whose sum is σ = 44529290568. Its totient is φ = 13888268800.

The previous prime is 28725165211. The next prime is 28725165239. The reversal of 28725165226 is 62256152782.

It is a Cunningham number, because it is equal to 169485²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 3460380625 + 25264784601 = 58825^2 + 158949^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1540765 + ... + 1559296.

Almost surely, 2^28725165226 is an apocalyptic number.

28725165226 is a deficient number, since it is larger than the sum of its proper divisors (15804125342).

28725165226 is a wasteful number, since it uses less digits than its factorization.

28725165226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100217.

The product of its digits is 806400, while the sum is 46.

The spelling of 28725165226 in words is "twenty-eight billion, seven hundred twenty-five million, one hundred sixty-five thousand, two hundred twenty-six".