27861505164 has 36 divisors (see below), whose sum is σ = 71153761224. Its totient is φ = 9191423232.

The previous prime is 27861505163. The next prime is 27861505219. The reversal of 27861505164 is 46150516872.

27861505164 is a `hidden beast` number, since 2 + 7 + 86 + 1 + 50 + 516 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (27861505163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3985842 + ... + 3992825.

Almost surely, 2^27861505164 is an apocalyptic number.

It is an amenable number.

27861505164 is an abundant number, since it is smaller than the sum of its proper divisors (43292256060).

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

27861505164 is a wasteful number, since it uses less digits than its factorization.

27861505164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7978774 (or 7978769 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 27861505164 in words is "twenty-seven billion, eight hundred sixty-one million, five hundred five thousand, one hundred sixty-four".