27705999721 has 8 divisors (see below), whose sum is σ = 27910164800. Its totient is φ = 27501904080.

The previous prime is 27705999707. The next prime is 27705999733. The reversal of 27705999721 is 12799950772.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27705999721 - 2¹³ = 27705991529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27705999701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1002316 + ... + 1029586.

It is an arithmetic number, because the mean of its divisors is an integer number (3488770600).

Almost surely, 2^27705999721 is an apocalyptic number.

It is an amenable number.

27705999721 is a deficient number, since it is larger than the sum of its proper divisors (204165079).

27705999721 is a wasteful number, since it uses less digits than its factorization.

27705999721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34719.

The product of its (nonzero) digits is 5000940, while the sum is 58.

The spelling of 27705999721 in words is "twenty-seven billion, seven hundred five million, nine hundred ninety-nine thousand, seven hundred twenty-one".