27449678821 has 8 divisors (see below), whose sum is σ = 28401964920. Its totient is φ = 26497775808.

The previous prime is 27449678771. The next prime is 27449678869. The reversal of 27449678821 is 12887694472.

It can be written as a sum of positive squares in 4 ways, for example, as 20552376321 + 6897302500 = 143361^2 + 83050^2 .

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 27449678821 - 2²¹ = 27447581669 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 (27449678891) 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 7 ways as a sum of consecutive naturals, for example, 54015 + ... + 240451.

It is an arithmetic number, because the mean of its divisors is an integer number (3550245615).

Almost surely, 2^27449678821 is an apocalyptic number.

It is an amenable number.

27449678821 is a deficient number, since it is larger than the sum of its proper divisors (952286099).

27449678821 is a wasteful number, since it uses less digits than its factorization.

27449678821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191543.

The product of its digits is 10838016, while the sum is 58.

The spelling of 27449678821 in words is "twenty-seven billion, four hundred forty-nine million, six hundred seventy-eight thousand, eight hundred twenty-one".