27728572881 has 4 divisors (see below), whose sum is σ = 36971430512. Its totient is φ = 18485715252.

The previous prime is 27728572873. The next prime is 27728572897. The reversal of 27728572881 is 18827582772.

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 not a de Polignac number, because 27728572881 - 2³ = 27728572873 is a prime.

It is a super-2 number, since 2×27728572881² (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 (27728572841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4621428811 + ... + 4621428816.

It is an arithmetic number, because the mean of its divisors is an integer number (9242857628).

Almost surely, 2^27728572881 is an apocalyptic number.

It is an amenable number.

27728572881 is a deficient number, since it is larger than the sum of its proper divisors (9242857631).

27728572881 is an equidigital number, since it uses as much as digits as its factorization.

27728572881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9242857630.

The product of its digits is 7024640, while the sum is 57.

The spelling of 27728572881 in words is "twenty-seven billion, seven hundred twenty-eight million, five hundred seventy-two thousand, eight hundred eighty-one".