27618641860 has 48 divisors (see below), whose sum is σ = 59636014704. Its totient is φ = 10736368128.

The previous prime is 27618641857. The next prime is 27618641873. The reversal of 27618641860 is 6814681672.

It can be written as a sum of positive squares in 8 ways, for example, as 11045169216 + 16573472644 = 105096^2 + 128738^2 .

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 627702 + ... + 670258.

It is an arithmetic number, because the mean of its divisors is an integer number (1242416973).

Almost surely, 2^27618641860 is an apocalyptic number.

27618641860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27618641860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29818007352).

27618641860 is an abundant number, since it is smaller than the sum of its proper divisors (32017372844).

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

27618641860 is a wasteful number, since it uses less digits than its factorization.

27618641860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43480 (or 43478 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 27618641860 in words is "twenty-seven billion, six hundred eighteen million, six hundred forty-one thousand, eight hundred sixty".