27947291880 has 128 divisors (see below), whose sum is σ = 87778857600. Its totient is φ = 7108856832.

The previous prime is 27947291873. The next prime is 27947291887. The reversal of 27947291880 is 8819274972.

It is an interprime number because it is at equal distance from previous prime (27947291873) and next prime (27947291887).

It is a super-2 number, since 2×27947291880² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27947291880.

It is not an unprimeable number, because it can be changed into a prime (27947291887) 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, 240462 + ... + 337218.

It is an arithmetic number, because the mean of its divisors is an integer number (685772325).

Almost surely, 2^27947291880 is an apocalyptic number.

27947291880 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 27947291880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43889428800).

27947291880 is an abundant number, since it is smaller than the sum of its proper divisors (59831565720).

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

27947291880 is a wasteful number, since it uses less digits than its factorization.

27947291880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96883 (or 96879 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 27947291880 in words is "twenty-seven billion, nine hundred forty-seven million, two hundred ninety-one thousand, eight hundred eighty".