27996645 has 16 divisors (see below), whose sum is σ = 45888192. Its totient is φ = 14567040.

The previous prime is 27996643. The next prime is 27996659. The reversal of 27996645 is 54669972.

It is not a de Polignac number, because 27996645 - 2¹ = 27996643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27996594 and 27996603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27996643) 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, 22147 + ... + 23376.

It is an arithmetic number, because the mean of its divisors is an integer number (2868012).

Almost surely, 2^27996645 is an apocalyptic number.

It is an amenable number.

27996645 is a deficient number, since it is larger than the sum of its proper divisors (17891547).

27996645 is a wasteful number, since it uses less digits than its factorization.

27996645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45572.

The product of its digits is 816480, while the sum is 48.

The square root of 27996645 is about 5291.1855949305. The cubic root of 27996645 is about 303.6467684222.

The spelling of 27996645 in words is "twenty-seven million, nine hundred ninety-six thousand, six hundred forty-five".