27121533678 has 96 divisors (see below), whose sum is σ = 63091750176. Its totient is φ = 8389914624.

The previous prime is 27121533667. The next prime is 27121533709. The reversal of 27121533678 is 87633512172.

27121533678 is a `hidden beast` number, since 2 + 71 + 215 + 3 + 367 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24813300 + ... + 24814392.

It is an arithmetic number, because the mean of its divisors is an integer number (657205731).

Almost surely, 2^27121533678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27121533678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31545875088).

27121533678 is an abundant number, since it is smaller than the sum of its proper divisors (35970216498).

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

27121533678 is a wasteful number, since it uses less digits than its factorization.

27121533678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178 (or 2175 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The spelling of 27121533678 in words is "twenty-seven billion, one hundred twenty-one million, five hundred thirty-three thousand, six hundred seventy-eight".