27879991840 has 144 divisors (see below), whose sum is σ = 70184620800. Its totient is φ = 10463670272.

The previous prime is 27879991819. The next prime is 27879991847. The reversal of 27879991840 is 4819997872.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (27879991847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19373841 + ... + 19375279.

It is an arithmetic number, because the mean of its divisors is an integer number (487393200).

Almost surely, 2^27879991840 is an apocalyptic number.

27879991840 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 27879991840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35092310400).

27879991840 is an abundant number, since it is smaller than the sum of its proper divisors (42304628960).

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

27879991840 is a wasteful number, since it uses less digits than its factorization.

27879991840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907 (or 1882 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 64.

The spelling of 27879991840 in words is "twenty-seven billion, eight hundred seventy-nine million, nine hundred ninety-one thousand, eight hundred forty".