27578782345 has 4 divisors (see below), whose sum is σ = 33094538820. Its totient is φ = 22063025872.

The previous prime is 27578782337. The next prime is 27578782417. The reversal of 27578782345 is 54328787572.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6599287696 + 20979494649 = 81236^2 + 144843^2 .

It is a cyclic number.

It is not a de Polignac number, because 27578782345 - 2³ = 27578782337 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 27578782345.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2757878230 + ... + 2757878239.

It is an arithmetic number, because the mean of its divisors is an integer number (8273634705).

Almost surely, 2^27578782345 is an apocalyptic number.

It is an amenable number.

27578782345 is a deficient number, since it is larger than the sum of its proper divisors (5515756475).

27578782345 is an equidigital number, since it uses as much as digits as its factorization.

27578782345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5515756474.

The product of its digits is 26342400, while the sum is 58.

The spelling of 27578782345 in words is "twenty-seven billion, five hundred seventy-eight million, seven hundred eighty-two thousand, three hundred forty-five".