27840788947 has 4 divisors (see below), whose sum is σ = 27855996016. Its totient is φ = 27825581880.

The previous prime is 27840788933. The next prime is 27840788951. The reversal of 27840788947 is 74988704872.

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 27840788947 - 2⁷ = 27840788819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27840788747) 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, 7600788 + ... + 7604449.

It is an arithmetic number, because the mean of its divisors is an integer number (6963999004).

Almost surely, 2^27840788947 is an apocalyptic number.

27840788947 is a deficient number, since it is larger than the sum of its proper divisors (15207069).

27840788947 is a wasteful number, since it uses less digits than its factorization.

27840788947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15207068.

The product of its (nonzero) digits is 50577408, while the sum is 64.

The spelling of 27840788947 in words is "twenty-seven billion, eight hundred forty million, seven hundred eighty-eight thousand, nine hundred forty-seven".