28090805605777 has 4 divisors (see below), whose sum is σ = 28620820805940. Its totient is φ = 27560790405616.

The previous prime is 28090805605741. The next prime is 28090805605817. The reversal of 28090805605777 is 77750650809082.

It is a happy number.

It is a Cunningham number, because it is equal to 5300076²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20250576004096 + 7840229601681 = 4500064^2 + 2800041^2 .

It is a cyclic number.

It is not a de Polignac number, because 28090805605777 - 2⁷ = 28090805605649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28090805605717) by changing a digit.

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, 265007600002 + ... + 265007600107.

It is an arithmetic number, because the mean of its divisors is an integer number (7155205201485).

Almost surely, 2^{28090805605777} is an apocalyptic number.

It is an amenable number.

28090805605777 is a deficient number, since it is larger than the sum of its proper divisors (530015200163).

28090805605777 is an equidigital number, since it uses as much as digits as its factorization.

28090805605777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530015200162.

The product of its (nonzero) digits is 59270400, while the sum is 64.

The spelling of 28090805605777 in words is "twenty-eight trillion, ninety billion, eight hundred five million, six hundred five thousand, seven hundred seventy-seven".