27812261887 has 2 divisors, whose sum is σ = 27812261888. Its totient is φ = 27812261886.

The previous prime is 27812261833. The next prime is 27812261947. The reversal of 27812261887 is 78816221872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27812261887 - 2⁷ = 27812261759 is a prime.

It is a super-2 number, since 2×27812261887² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27812261287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13906130943 + 13906130944.

It is an arithmetic number, because the mean of its divisors is an integer number (13906130944).

Almost surely, 2^27812261887 is an apocalyptic number.

27812261887 is a deficient number, since it is larger than the sum of its proper divisors (1).

27812261887 is an equidigital number, since it uses as much as digits as its factorization.

27812261887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1204224, while the sum is 52.

The spelling of 27812261887 in words is "twenty-seven billion, eight hundred twelve million, two hundred sixty-one thousand, eight hundred eighty-seven".