27800027761 has 4 divisors (see below), whose sum is σ = 30327303024. Its totient is φ = 25272752500.

The previous prime is 27800027741. The next prime is 27800027771. The reversal of 27800027761 is 16772000872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27800027761 - 2¹⁷ = 27799896689 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27800027741) 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, 1263637615 + ... + 1263637636.

It is an arithmetic number, because the mean of its divisors is an integer number (7581825756).

Almost surely, 2^27800027761 is an apocalyptic number.

It is an amenable number.

27800027761 is a deficient number, since it is larger than the sum of its proper divisors (2527275263).

27800027761 is a wasteful number, since it uses less digits than its factorization.

27800027761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527275262.

The product of its (nonzero) digits is 65856, while the sum is 40.

The spelling of 27800027761 in words is "twenty-seven billion, eight hundred million, twenty-seven thousand, seven hundred sixty-one".