27684021 has 8 divisors (see below), whose sum is σ = 36988000. Its totient is φ = 18418032.

The previous prime is 27684011. The next prime is 27684037. The reversal of 27684021 is 12048672.

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

It is not a de Polignac number, because 27684021 - 2¹³ = 27675829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27684021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27684011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7750 + ... + 10743.

It is an arithmetic number, because the mean of its divisors is an integer number (4623500).

Almost surely, 2^27684021 is an apocalyptic number.

It is an amenable number.

27684021 is a deficient number, since it is larger than the sum of its proper divisors (9303979).

27684021 is a wasteful number, since it uses less digits than its factorization.

27684021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18995.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 27684021 is about 5261.5607000205. The cubic root of 27684021 is about 302.5123133207.

The spelling of 27684021 in words is "twenty-seven million, six hundred eighty-four thousand, twenty-one".