27909043917 has 16 divisors (see below), whose sum is σ = 37267331520. Its totient is φ = 18578419200.

The previous prime is 27909043879. The next prime is 27909043961. The reversal of 27909043917 is 71934090972.

It is not a de Polignac number, because 27909043917 - 2⁶ = 27909043853 is a prime.

It is a super-2 number, since 2×27909043917² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27909043917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27909043997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8805309 + ... + 8808477.

It is an arithmetic number, because the mean of its divisors is an integer number (2329208220).

Almost surely, 2^27909043917 is an apocalyptic number.

It is an amenable number.

27909043917 is a deficient number, since it is larger than the sum of its proper divisors (9358287603).

27909043917 is a wasteful number, since it uses less digits than its factorization.

27909043917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604.

The product of its (nonzero) digits is 857304, while the sum is 51.

The spelling of 27909043917 in words is "twenty-seven billion, nine hundred nine million, forty-three thousand, nine hundred seventeen".