27808911405 has 24 divisors (see below), whose sum is σ = 52584124320. Its totient is φ = 13483108320.

The previous prime is 27808911401. The next prime is 27808911407. The reversal of 27808911405 is 50411980872.

It is not a de Polignac number, because 27808911405 - 2² = 27808911401 is a prime.

It is a super-2 number, since 2×27808911405² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27808911401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28089315 + ... + 28090304.

It is an arithmetic number, because the mean of its divisors is an integer number (2191005180).

Almost surely, 2^27808911405 is an apocalyptic number.

It is an amenable number.

27808911405 is a deficient number, since it is larger than the sum of its proper divisors (24775212915).

27808911405 is a wasteful number, since it uses less digits than its factorization.

27808911405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56179641 (or 56179638 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 27808911405 in words is "twenty-seven billion, eight hundred eight million, nine hundred eleven thousand, four hundred five".