28812808786 has 8 divisors (see below), whose sum is σ = 43225297020. Its totient is φ = 14404376448.

The previous prime is 28812808729. The next prime is 28812808789. The reversal of 28812808786 is 68780821882.

It can be written as a sum of positive squares in 2 ways, for example, as 27017168161 + 1795640625 = 164369^2 + 42375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28812808786.

It is not an unprimeable number, because it can be changed into a prime (28812808789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996151 + ... + 1024666.

Almost surely, 2^28812808786 is an apocalyptic number.

28812808786 is a deficient number, since it is larger than the sum of its proper divisors (14412488234).

28812808786 is a wasteful number, since it uses less digits than its factorization.

28812808786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027948.

The product of its (nonzero) digits is 5505024, while the sum is 58.

The spelling of 28812808786 in words is "twenty-eight billion, eight hundred twelve million, eight hundred eight thousand, seven hundred eighty-six".