27978312 has 32 divisors (see below), whose sum is σ = 70087680. Its totient is φ = 9307200.

The previous prime is 27978289. The next prime is 27978319. The reversal of 27978312 is 21387972.

It is not an unprimeable number, because it can be changed into a prime (27978319) 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, 15993 + ... + 17655.

It is an arithmetic number, because the mean of its divisors is an integer number (2190240).

Almost surely, 2^27978312 is an apocalyptic number.

It is an amenable number.

27978312 is an abundant number, since it is smaller than the sum of its proper divisors (42109368).

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

27978312 is a wasteful number, since it uses less digits than its factorization.

27978312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373 (or 2369 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 27978312 is about 5289.4529017659. The cubic root of 27978312 is about 303.5804751010.

The spelling of 27978312 in words is "twenty-seven million, nine hundred seventy-eight thousand, three hundred twelve".