27978126 has 32 divisors (see below), whose sum is σ = 61890048. Its totient is φ = 8360640.

The previous prime is 27978121. The next prime is 27978149. The reversal of 27978126 is 62187972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1915 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (1934064).

Almost surely, 2^27978126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27978126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30945024).

27978126 is an abundant number, since it is smaller than the sum of its proper divisors (33911922).

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

27978126 is a wasteful number, since it uses less digits than its factorization.

27978126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896.

The product of its digits is 84672, while the sum is 42.

The square root of 27978126 is about 5289.4353195781. The cubic root of 27978126 is about 303.5798023645.

The spelling of 27978126 in words is "twenty-seven million, nine hundred seventy-eight thousand, one hundred twenty-six".