28112768836 has 12 divisors (see below), whose sum is σ = 49199961580. Its totient is φ = 14055636960.

The previous prime is 28112768821. The next prime is 28112768839. The reversal of 28112768836 is 63886721182.

It can be written as a sum of positive squares in 2 ways, for example, as 6619449600 + 21493319236 = 81360^2 + 146606^2 .

It is not an unprimeable number, because it can be changed into a prime (28112768839) 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, 97491 + ... + 256378.

Almost surely, 2^28112768836 is an apocalyptic number.

It is an amenable number.

28112768836 is a deficient number, since it is larger than the sum of its proper divisors (21087192744).

28112768836 is a wasteful number, since it uses less digits than its factorization.

28112768836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373734 (or 373732 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 52.

The spelling of 28112768836 in words is "twenty-eight billion, one hundred twelve million, seven hundred sixty-eight thousand, eight hundred thirty-six".