27720691 has 4 divisors (see below), whose sum is σ = 27831384. Its totient is φ = 27610000.

The previous prime is 27720683. The next prime is 27720697. The reversal of 27720691 is 19602772.

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

It is not a de Polignac number, because 27720691 - 2³ = 27720683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27720697) 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, 54970 + ... + 55471.

It is an arithmetic number, because the mean of its divisors is an integer number (6957846).

Almost surely, 2^27720691 is an apocalyptic number.

27720691 is a deficient number, since it is larger than the sum of its proper divisors (110693).

27720691 is a wasteful number, since it uses less digits than its factorization.

27720691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110692.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 27720691 is about 5265.0442543249. The cubic root of 27720691 is about 302.6458227337.

The spelling of 27720691 in words is "twenty-seven million, seven hundred twenty thousand, six hundred ninety-one".