28320720836 has 6 divisors (see below), whose sum is σ = 49561261470. Its totient is φ = 14160360416.

The previous prime is 28320720829. The next prime is 28320720853. The reversal of 28320720836 is 63802702382.

It can be written as a sum of positive squares in only one way, i.e., 28154826436 + 165894400 = 167794^2 + 12880^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28320720793 and 28320720802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3540090101 + ... + 3540090108.

It is an arithmetic number, because the mean of its divisors is an integer number (8260210245).

Almost surely, 2^28320720836 is an apocalyptic number.

It is an amenable number.

28320720836 is a deficient number, since it is larger than the sum of its proper divisors (21240540634).

28320720836 is a wasteful number, since it uses less digits than its factorization.

28320720836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080180213 (or 7080180211 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 28320720836 in words is "twenty-eight billion, three hundred twenty million, seven hundred twenty thousand, eight hundred thirty-six".