27978678 has 192 divisors, whose sum is σ = 83865600. Its totient is φ = 6531840.

The previous prime is 27978661. The next prime is 27978701. The reversal of 27978678 is 87687972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 902523 + ... + 902553.

It is an arithmetic number, because the mean of its divisors is an integer number (436800).

Almost surely, 2^27978678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27978678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41932800).

27978678 is an abundant number, since it is smaller than the sum of its proper divisors (55886922).

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

27978678 is a wasteful number, since it uses less digits than its factorization.

27978678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 104 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 27978678 is about 5289.4874988036. The cubic root of 27978678 is about 303.5817988641.

The spelling of 27978678 in words is "twenty-seven million, nine hundred seventy-eight thousand, six hundred seventy-eight".