28205618437796 has 12 divisors (see below), whose sum is σ = 49359893843148. Its totient is φ = 14102791625472.

The previous prime is 28205618437781. The next prime is 28205618437859. The reversal of 28205618437796 is 69773481650282.

It can be written as a sum of positive squares in 2 ways, for example, as 2438969358400 + 25766649079396 = 1561720^2 + 5076086^2 .

It is a super-2 number, since 2×28205618437796² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384101 + ... + 7520556.

It is an arithmetic number, because the mean of its divisors is an integer number (4113324486929).

It is a 1-persistent number, because it is pandigital, but 2⋅28205618437796 = 56411236875592 is not.

Almost surely, 2^{28205618437796} is an apocalyptic number.

It is an amenable number.

28205618437796 is a deficient number, since it is larger than the sum of its proper divisors (21154275405352).

28205618437796 is a wasteful number, since it uses less digits than its factorization.

28205618437796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8796718 (or 8796716 counting only the distinct ones).

The product of its (nonzero) digits is 243855360, while the sum is 68.

The spelling of 28205618437796 in words is "twenty-eight trillion, two hundred five billion, six hundred eighteen million, four hundred thirty-seven thousand, seven hundred ninety-six".