27872117281 has 4 divisors (see below), whose sum is σ = 27893509312. Its totient is φ = 27850725252.

The previous prime is 27872117261. The next prime is 27872117323. The reversal of 27872117281 is 18271127872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27872117281 - 2⁵ = 27872117249 is a prime.

It is a super-2 number, since 2×27872117281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27872117261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10694061 + ... + 10696666.

It is an arithmetic number, because the mean of its divisors is an integer number (6973377328).

Almost surely, 2^27872117281 is an apocalyptic number.

It is an amenable number.

27872117281 is a deficient number, since it is larger than the sum of its proper divisors (21392031).

27872117281 is a wasteful number, since it uses less digits than its factorization.

27872117281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21392030.

The product of its digits is 175616, while the sum is 46.

The spelling of 27872117281 in words is "twenty-seven billion, eight hundred seventy-two million, one hundred seventeen thousand, two hundred eighty-one".