27978671427 has 8 divisors (see below), whose sum is σ = 42634166016. Its totient is φ = 15987812232.

The previous prime is 27978671389. The next prime is 27978671453. The reversal of 27978671427 is 72417687972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27978671427 - 2⁷ = 27978671299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27978651427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666158823 + ... + 666158864.

It is an arithmetic number, because the mean of its divisors is an integer number (5329270752).

Almost surely, 2^27978671427 is an apocalyptic number.

27978671427 is a deficient number, since it is larger than the sum of its proper divisors (14655494589).

27978671427 is a wasteful number, since it uses less digits than its factorization.

27978671427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332317697.

The product of its digits is 16595712, while the sum is 60.

The spelling of 27978671427 in words is "twenty-seven billion, nine hundred seventy-eight million, six hundred seventy-one thousand, four hundred twenty-seven".