27717628997 has 4 divisors (see below), whose sum is σ = 27820668780. Its totient is φ = 27614589216.

The previous prime is 27717628993. The next prime is 27717629003. The reversal of 27717628997 is 79982671772.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1717356481 + 26000272516 = 41441^2 + 161246^2 .

It is a cyclic number.

It is not a de Polignac number, because 27717628997 - 2² = 27717628993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27717628993) 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, 51519488 + ... + 51520025.

It is an arithmetic number, because the mean of its divisors is an integer number (6955167195).

Almost surely, 2^27717628997 is an apocalyptic number.

It is an amenable number.

27717628997 is a deficient number, since it is larger than the sum of its proper divisors (103039783).

27717628997 is a wasteful number, since it uses less digits than its factorization.

27717628997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103039782.

The product of its digits is 37340352, while the sum is 65.

The spelling of 27717628997 in words is "twenty-seven billion, seven hundred seventeen million, six hundred twenty-eight thousand, nine hundred ninety-seven".