28665212852 has 12 divisors (see below), whose sum is σ = 50218126980. Its totient is φ = 14317176576.

The previous prime is 28665212843. The next prime is 28665212861. The reversal of 28665212852 is 25821256682.

It is an interprime number because it is at equal distance from previous prime (28665212843) and next prime (28665212861).

It can be written as a sum of positive squares in 2 ways, for example, as 1292833936 + 27372378916 = 35956^2 + 165446^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28665212797 and 28665212806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3853283 + ... + 3860714.

It is an arithmetic number, because the mean of its divisors is an integer number (4184843915).

Almost surely, 2^28665212852 is an apocalyptic number.

It is an amenable number.

28665212852 is a deficient number, since it is larger than the sum of its proper divisors (21552914128).

28665212852 is a wasteful number, since it uses less digits than its factorization.

28665212852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7714930 (or 7714928 counting only the distinct ones).

The product of its digits is 921600, while the sum is 47.

The spelling of 28665212852 in words is "twenty-eight billion, six hundred sixty-five million, two hundred twelve thousand, eight hundred fifty-two".