28204535656 has 24 divisors (see below), whose sum is σ = 58128151410. Its totient is φ = 12820243040.

The previous prime is 28204535647. The next prime is 28204535659. The reversal of 28204535656 is 65653540282.

It can be written as a sum of positive squares in only one way, i.e., 25069655556 + 3134880100 = 158334^2 + 55990^2 .

It is not an unprimeable number, because it can be changed into a prime (28204535659) 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 5 ways as a sum of consecutive naturals, for example, 14567491 + ... + 14569426.

Almost surely, 2^28204535656 is an apocalyptic number.

It is an amenable number.

28204535656 is an abundant number, since it is smaller than the sum of its proper divisors (29923615754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28204535656 is a wasteful number, since it uses less digits than its factorization.

28204535656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29136945 (or 29136930 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 28204535656 in words is "twenty-eight billion, two hundred four million, five hundred thirty-five thousand, six hundred fifty-six".