27756723989 has 8 divisors (see below), whose sum is σ = 27844423992. Its totient is φ = 27669159360.

The previous prime is 27756723979. The next prime is 27756724019. The reversal of 27756723989 is 98932765772.

It can be written as a sum of positive squares in 4 ways, for example, as 4180656964 + 23576067025 = 64658^2 + 153545^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27756723989 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 (27756723979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385007 + ... + 451379.

It is an arithmetic number, because the mean of its divisors is an integer number (3480552999).

Almost surely, 2^27756723989 is an apocalyptic number.

It is an amenable number.

27756723989 is a deficient number, since it is larger than the sum of its proper divisors (87700003).

27756723989 is an equidigital number, since it uses as much as digits as its factorization.

27756723989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67687.

The product of its digits is 80015040, while the sum is 65.

The spelling of 27756723989 in words is "twenty-seven billion, seven hundred fifty-six million, seven hundred twenty-three thousand, nine hundred eighty-nine".