27478105987 has 4 divisors (see below), whose sum is σ = 28148303736. Its totient is φ = 26807908240.

The previous prime is 27478105973. The next prime is 27478106041. The reversal of 27478105987 is 78950187472.

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

It is a cyclic number.

It is not a de Polignac number, because 27478105987 - 2⁷ = 27478105859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27478105087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335098813 + ... + 335098894.

It is an arithmetic number, because the mean of its divisors is an integer number (7037075934).

Almost surely, 2^27478105987 is an apocalyptic number.

27478105987 is a deficient number, since it is larger than the sum of its proper divisors (670197749).

27478105987 is an equidigital number, since it uses as much as digits as its factorization.

27478105987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670197748.

The product of its (nonzero) digits is 7902720, while the sum is 58.

The spelling of 27478105987 in words is "twenty-seven billion, four hundred seventy-eight million, one hundred five thousand, nine hundred eighty-seven".