27771641604 has 108 divisors (see below), whose sum is σ = 82113965388. Its totient is φ = 7890825600.

The previous prime is 27771641603. The next prime is 27771641687. The reversal of 27771641604 is 40614617772.

27771641604 is a `hidden beast` number, since 27 + 7 + 7 + 16 + 4 + 1 + 604 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1366041600 + 26405600004 = 36960^2 + 162498^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27771641604.

It is not an unprimeable number, because it can be changed into a prime (27771641603) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 275794 + ... + 362774.

Almost surely, 2^27771641604 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27771641604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41056982694).

27771641604 is an abundant number, since it is smaller than the sum of its proper divisors (54342323784).

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

27771641604 is a wasteful number, since it uses less digits than its factorization.

27771641604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87186 (or 87174 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 27771641604 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred forty-one thousand, six hundred four".