27956818140 has 96 divisors (see below), whose sum is σ = 79499058240. Its totient is φ = 7339769856.

The previous prime is 27956818129. The next prime is 27956818171. The reversal of 27956818140 is 4181865972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1110816 + ... + 1135704.

It is an arithmetic number, because the mean of its divisors is an integer number (828115190).

Almost surely, 2^27956818140 is an apocalyptic number.

27956818140 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 27956818140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39749529120).

27956818140 is an abundant number, since it is smaller than the sum of its proper divisors (51542240100).

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

27956818140 is a wasteful number, since it uses less digits than its factorization.

27956818140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25191 (or 25189 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 27956818140 in words is "twenty-seven billion, nine hundred fifty-six million, eight hundred eighteen thousand, one hundred forty".