27880008891 has 48 divisors (see below), whose sum is σ = 47505327360. Its totient is φ = 14205058560.

The previous prime is 27880008881. The next prime is 27880008899. The reversal of 27880008891 is 19880008872.

It is a happy number.

It is not a de Polignac number, because 27880008891 - 2¹³ = 27880000699 is a prime.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (27880008899) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5580 + ... + 236201.

It is an arithmetic number, because the mean of its divisors is an integer number (989694320).

Almost surely, 2^27880008891 is an apocalyptic number.

27880008891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

27880008891 is a deficient number, since it is larger than the sum of its proper divisors (19625318469).

27880008891 is a wasteful number, since it uses less digits than its factorization.

27880008891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241844 (or 241827 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 51.

The spelling of 27880008891 in words is "twenty-seven billion, eight hundred eighty million, eight thousand, eight hundred ninety-one".