27705999720 has 64 divisors (see below), whose sum is σ = 94992001920. Its totient is φ = 6332799744.

The previous prime is 27705999707. The next prime is 27705999733. The reversal of 27705999720 is 2799950772.

It is an interprime number because it is at equal distance from previous prime (27705999707) and next prime (27705999733).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16490827 + ... + 16492506.

It is an arithmetic number, because the mean of its divisors is an integer number (1484250030).

Almost surely, 2^27705999720 is an apocalyptic number.

27705999720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27705999720 is an abundant number, since it is smaller than the sum of its proper divisors (67286002200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27705999720 is a wasteful number, since it uses less digits than its factorization.

27705999720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32983354 (or 32983350 counting only the distinct ones).

The product of its (nonzero) digits is 5000940, while the sum is 57.

The spelling of 27705999720 in words is "twenty-seven billion, seven hundred five million, nine hundred ninety-nine thousand, seven hundred twenty".