27193648638 has 64 divisors (see below), whose sum is σ = 60628357440. Its totient is φ = 8073719808.

The previous prime is 27193648633. The next prime is 27193648687. The reversal of 27193648638 is 83684639172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27193648633) 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, 5274670 + ... + 5279822.

It is an arithmetic number, because the mean of its divisors is an integer number (947318085).

Almost surely, 2^27193648638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27193648638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30314178720).

27193648638 is an abundant number, since it is smaller than the sum of its proper divisors (33434708802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27193648638 is a wasteful number, since it uses less digits than its factorization.

27193648638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7533.

The product of its digits is 10450944, while the sum is 57.

The spelling of 27193648638 in words is "twenty-seven billion, one hundred ninety-three million, six hundred forty-eight thousand, six hundred thirty-eight".