27996521 has 8 divisors (see below), whose sum is σ = 32029824. Its totient is φ = 23971680.

The previous prime is 27996517. The next prime is 27996523. The reversal of 27996521 is 12569972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27996521 - 2² = 27996517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27996523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8636 + ... + 11426.

It is an arithmetic number, because the mean of its divisors is an integer number (4003728).

Almost surely, 2^27996521 is an apocalyptic number.

It is an amenable number.

27996521 is a deficient number, since it is larger than the sum of its proper divisors (4033303).

27996521 is a wasteful number, since it uses less digits than its factorization.

27996521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4231.

The product of its digits is 68040, while the sum is 41.

The square root of 27996521 is about 5291.1738773168. The cubic root of 27996521 is about 303.6463201273.

The spelling of 27996521 in words is "twenty-seven million, nine hundred ninety-six thousand, five hundred twenty-one".