27278623145 has 8 divisors (see below), whose sum is σ = 33619060104. Its totient is φ = 21233090304.

The previous prime is 27278623129. The next prime is 27278623187. The reversal of 27278623145 is 54132687272.

It can be written as a sum of positive squares in 4 ways, for example, as 6942722329 + 20335900816 = 83323^2 + 142604^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 27278623145 - 2⁴ = 27278623129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27278623145.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 73725824 + ... + 73726193.

It is an arithmetic number, because the mean of its divisors is an integer number (4202382513).

Almost surely, 2^27278623145 is an apocalyptic number.

It is an amenable number.

27278623145 is a deficient number, since it is larger than the sum of its proper divisors (6340436959).

27278623145 is a wasteful number, since it uses less digits than its factorization.

27278623145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147452059.

The product of its digits is 1128960, while the sum is 47.

The spelling of 27278623145 in words is "twenty-seven billion, two hundred seventy-eight million, six hundred twenty-three thousand, one hundred forty-five".