27996728 has 16 divisors (see below), whose sum is σ = 55257000. Its totient is φ = 13261536.

The previous prime is 27996721. The next prime is 27996733. The reversal of 27996728 is 82769972.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27996721) 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, 91943 + ... + 92246.

Almost surely, 2^27996728 is an apocalyptic number.

It is an amenable number.

27996728 is a deficient number, since it is larger than the sum of its proper divisors (27260272).

27996728 is a wasteful number, since it uses less digits than its factorization.

27996728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184214 (or 184210 counting only the distinct ones).

The product of its digits is 762048, while the sum is 50.

The square root of 27996728 is about 5291.1934381574. The cubic root of 27996728 is about 303.6470684898.

The spelling of 27996728 in words is "twenty-seven million, nine hundred ninety-six thousand, seven hundred twenty-eight".