28109990852 has 6 divisors (see below), whose sum is σ = 49192483998. Its totient is φ = 14054995424.

The previous prime is 28109990849. The next prime is 28109990879. The reversal of 28109990852 is 25809990182.

It can be written as a sum of positive squares in only one way, i.e., 26161121536 + 1948869316 = 161744^2 + 44146^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28109990794 and 28109990803.

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 as a sum of consecutive naturals, namely, 3513748853 + ... + 3513748860.

It is an arithmetic number, because the mean of its divisors is an integer number (8198747333).

Almost surely, 2^28109990852 is an apocalyptic number.

It is an amenable number.

28109990852 is a deficient number, since it is larger than the sum of its proper divisors (21082493146).

28109990852 is a wasteful number, since it uses less digits than its factorization.

28109990852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7027497717 (or 7027497715 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 53.

The spelling of 28109990852 in words is "twenty-eight billion, one hundred nine million, nine hundred ninety thousand, eight hundred fifty-two".