28027561311907 has 4 divisors (see below), whose sum is σ = 29676241389096. Its totient is φ = 26378881234720.

The previous prime is 28027561311881. The next prime is 28027561311913. The reversal of 28027561311907 is 70911316572082.

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

It is not a de Polignac number, because 28027561311907 - 2¹⁹ = 28027560787619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28027561311007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824340038569 + ... + 824340038602.

It is an arithmetic number, because the mean of its divisors is an integer number (7419060347274).

Almost surely, 2^{28027561311907} is an apocalyptic number.

28027561311907 is a deficient number, since it is larger than the sum of its proper divisors (1648680077189).

28027561311907 is a wasteful number, since it uses less digits than its factorization.

28027561311907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648680077188.

The product of its (nonzero) digits is 1270080, while the sum is 52.

Adding to 28027561311907 its reverse (70911316572082), we get a palindrome (98938877883989).

The spelling of 28027561311907 in words is "twenty-eight trillion, twenty-seven billion, five hundred sixty-one million, three hundred eleven thousand, nine hundred seven".