27809469847 has 4 divisors (see below), whose sum is σ = 28012458816. Its totient is φ = 27606480880.

The previous prime is 27809469773. The next prime is 27809469869. The reversal of 27809469847 is 74896490872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27809469847 is a prime.

It is a super-2 number, since 2×27809469847² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27809464847) 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, 101494279 + ... + 101494552.

It is an arithmetic number, because the mean of its divisors is an integer number (7003114704).

Almost surely, 2^27809469847 is an apocalyptic number.

27809469847 is a deficient number, since it is larger than the sum of its proper divisors (202988969).

27809469847 is a wasteful number, since it uses less digits than its factorization.

27809469847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202988968.

The product of its (nonzero) digits is 48771072, while the sum is 64.

The spelling of 27809469847 in words is "twenty-seven billion, eight hundred nine million, four hundred sixty-nine thousand, eight hundred forty-seven".