27640277638 has 32 divisors (see below), whose sum is σ = 43659453600. Its totient is φ = 13104666624.

The previous prime is 27640277597. The next prime is 27640277641. The reversal of 27640277638 is 83677204672.

27640277638 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 4161256 + ... + 4167892.

It is an arithmetic number, because the mean of its divisors is an integer number (1364357925).

Almost surely, 2^27640277638 is an apocalyptic number.

27640277638 is a deficient number, since it is larger than the sum of its proper divisors (16019175962).

27640277638 is a wasteful number, since it uses less digits than its factorization.

27640277638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7944.

The product of its (nonzero) digits is 4741632, while the sum is 52.

The spelling of 27640277638 in words is "twenty-seven billion, six hundred forty million, two hundred seventy-seven thousand, six hundred thirty-eight".