27726680638 has 32 divisors (see below), whose sum is σ = 44202244320. Its totient is φ = 12998845440.

The previous prime is 27726680629. The next prime is 27726680701. The reversal of 27726680638 is 83608662772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13504420 + ... + 13506472.

It is an arithmetic number, because the mean of its divisors is an integer number (1381320135).

Almost surely, 2^27726680638 is an apocalyptic number.

27726680638 is a deficient number, since it is larger than the sum of its proper divisors (16475563682).

27726680638 is a wasteful number, since it uses less digits than its factorization.

27726680638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The spelling of 27726680638 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred eighty thousand, six hundred thirty-eight".