27312012 has 144 divisors (see below), whose sum is σ = 88929120. Its totient is φ = 7185024.

The previous prime is 27312011. The next prime is 27312083. The reversal of 27312012 is 21021372.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (27312011) 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 47 ways as a sum of consecutive naturals, for example, 68598 + ... + 68994.

Almost surely, 2^27312012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27312012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44464560).

27312012 is an abundant number, since it is smaller than the sum of its proper divisors (61617108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27312012 is a wasteful number, since it uses less digits than its factorization.

27312012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 27312012 is about 5226.0895514715. The cubic root of 27312012 is about 301.1511769883.

Adding to 27312012 its reverse (21021372), we get a palindrome (48333384).

The spelling of 27312012 in words is "twenty-seven million, three hundred twelve thousand, twelve".