27904866797 has 4 divisors (see below), whose sum is σ = 27941154780. Its totient is φ = 27868578816.

The previous prime is 27904866791. The next prime is 27904866799. The reversal of 27904866797 is 79766840972.

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 21310452361 + 6594414436 = 145981^2 + 81206^2 .

It is a cyclic number.

It is not a de Polignac number, because 27904866797 - 2¹⁰ = 27904865773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27904866791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18142838 + ... + 18144375.

It is an arithmetic number, because the mean of its divisors is an integer number (6985288695).

Almost surely, 2^27904866797 is an apocalyptic number.

It is an amenable number.

27904866797 is a deficient number, since it is larger than the sum of its proper divisors (36287983).

27904866797 is an equidigital number, since it uses as much as digits as its factorization.

27904866797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36287982.

The product of its (nonzero) digits is 64012032, while the sum is 65.

The spelling of 27904866797 in words is "twenty-seven billion, nine hundred four million, eight hundred sixty-six thousand, seven hundred ninety-seven".