28320772535 has 32 divisors (see below), whose sum is σ = 37590013440. Its totient is φ = 20312496000.

The previous prime is 28320772523. The next prime is 28320772537. The reversal of 28320772535 is 53527702382.

It is not a de Polignac number, because 28320772535 - 2⁸ = 28320772279 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320772537) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 1142129 + ... + 1166661.

It is an arithmetic number, because the mean of its divisors is an integer number (1174687920).

Almost surely, 2^28320772535 is an apocalyptic number.

28320772535 is a deficient number, since it is larger than the sum of its proper divisors (9269240905).

28320772535 is a wasteful number, since it uses less digits than its factorization.

28320772535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24839.

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 28320772535 in words is "twenty-eight billion, three hundred twenty million, seven hundred seventy-two thousand, five hundred thirty-five".