27726868821 has 32 divisors (see below), whose sum is σ = 38702821248. Its totient is φ = 17639424000.

The previous prime is 27726868789. The next prime is 27726868823. The reversal of 27726868821 is 12886862772.

It is not a de Polignac number, because 27726868821 - 2⁵ = 27726868789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27726868823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1724821 + ... + 1740821.

It is an arithmetic number, because the mean of its divisors is an integer number (1209463164).

Almost surely, 2^27726868821 is an apocalyptic number.

It is an amenable number.

27726868821 is a deficient number, since it is larger than the sum of its proper divisors (10975952427).

27726868821 is a wasteful number, since it uses less digits than its factorization.

27726868821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16341.

The product of its digits is 7225344, while the sum is 57.

The spelling of 27726868821 in words is "twenty-seven billion, seven hundred twenty-six million, eight hundred sixty-eight thousand, eight hundred twenty-one".