28131775652 has 12 divisors (see below), whose sum is σ = 49231973196. Its totient is φ = 14065497600.

The previous prime is 28131775619. The next prime is 28131775667. The reversal of 28131775652 is 25657713182.

It can be written as a sum of positive squares in 2 ways, for example, as 6820447396 + 21311328256 = 82586^2 + 145984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28131775597 and 28131775606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117152 + ... + 264552.

It is an arithmetic number, because the mean of its divisors is an integer number (4102664433).

Almost surely, 2^28131775652 is an apocalyptic number.

It is an amenable number.

28131775652 is a deficient number, since it is larger than the sum of its proper divisors (21100197544).

28131775652 is a wasteful number, since it uses less digits than its factorization.

28131775652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195118 (or 195116 counting only the distinct ones).

The product of its digits is 705600, while the sum is 47.

The spelling of 28131775652 in words is "twenty-eight billion, one hundred thirty-one million, seven hundred seventy-five thousand, six hundred fifty-two".