27551131278 has 64 divisors (see below), whose sum is σ = 61072704000. Its totient is φ = 8216336000.

The previous prime is 27551131271. The next prime is 27551131339. The reversal of 27551131278 is 87213115572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27551131271) 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, 1100848 + ... + 1125596.

It is an arithmetic number, because the mean of its divisors is an integer number (954261000).

Almost surely, 2^27551131278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27551131278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30536352000).

27551131278 is an abundant number, since it is smaller than the sum of its proper divisors (33521572722).

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

27551131278 is a wasteful number, since it uses less digits than its factorization.

27551131278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25033.

The product of its digits is 117600, while the sum is 42.

The spelling of 27551131278 in words is "twenty-seven billion, five hundred fifty-one million, one hundred thirty-one thousand, two hundred seventy-eight".