27990261227 has 4 divisors (see below), whose sum is σ = 28262011440. Its totient is φ = 27718511016.

The previous prime is 27990261223. The next prime is 27990261241. The reversal of 27990261227 is 72216209972.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27990261227 - 2² = 27990261223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27990261223) 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, 135874952 + ... + 135875157.

It is an arithmetic number, because the mean of its divisors is an integer number (7065502860).

Almost surely, 2^27990261227 is an apocalyptic number.

27990261227 is a deficient number, since it is larger than the sum of its proper divisors (271750213).

27990261227 is a wasteful number, since it uses less digits than its factorization.

27990261227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271750212.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 27990261227 in words is "twenty-seven billion, nine hundred ninety million, two hundred sixty-one thousand, two hundred twenty-seven".