27789953969 has 4 divisors (see below), whose sum is σ = 28541033844. Its totient is φ = 27038874096.

The previous prime is 27789953963. The next prime is 27789953977. The reversal of 27789953969 is 96935998772.

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 23245576225 + 4544377744 = 152465^2 + 67412^2 .

It is a cyclic number.

It is not a de Polignac number, because 27789953969 - 2⁴ = 27789953953 is a prime.

It is a super-2 number, since 2×27789953969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 27789953896 and 27789953905.

It is not an unprimeable number, because it can be changed into a prime (27789953963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375539882 + ... + 375539955.

It is an arithmetic number, because the mean of its divisors is an integer number (7135258461).

Almost surely, 2^27789953969 is an apocalyptic number.

It is an amenable number.

27789953969 is a deficient number, since it is larger than the sum of its proper divisors (751079875).

27789953969 is an equidigital number, since it uses as much as digits as its factorization.

27789953969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751079874.

The product of its digits is 462944160, while the sum is 74.

The spelling of 27789953969 in words is "twenty-seven billion, seven hundred eighty-nine million, nine hundred fifty-three thousand, nine hundred sixty-nine".