27591997808 has 20 divisors (see below), whose sum is σ = 53464053528. Its totient is φ = 13794822720.

The previous prime is 27591997799. The next prime is 27591997843. The reversal of 27591997808 is 80879919572.

It is a super-2 number, since 2×27591997808² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138563 + ... + 272733.

Almost surely, 2^27591997808 is an apocalyptic number.

It is an amenable number.

27591997808 is a deficient number, since it is larger than the sum of its proper divisors (25872055720).

27591997808 is a wasteful number, since it uses less digits than its factorization.

27591997808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147032 (or 147026 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 65.

The spelling of 27591997808 in words is "twenty-seven billion, five hundred ninety-one million, nine hundred ninety-seven thousand, eight hundred eight".