27578512397 has 4 divisors (see below), whose sum is σ = 27579036540. Its totient is φ = 27577988256.

The previous prime is 27578512387. The next prime is 27578512427. The reversal of 27578512397 is 79321587572.

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 19206079396 + 8372433001 = 138586^2 + 91501^2 .

It is a cyclic number.

It is not a de Polignac number, because 27578512397 - 2⁶ = 27578512333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27578512387) 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, 173072 + ... + 291737.

It is an arithmetic number, because the mean of its divisors is an integer number (6894759135).

Almost surely, 2^27578512397 is an apocalyptic number.

It is an amenable number.

27578512397 is a deficient number, since it is larger than the sum of its proper divisors (524143).

27578512397 is an equidigital number, since it uses as much as digits as its factorization.

27578512397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524142.

The product of its digits is 7408800, while the sum is 56.

The spelling of 27578512397 in words is "twenty-seven billion, five hundred seventy-eight million, five hundred twelve thousand, three hundred ninety-seven".