27997424 has 120 divisors (see below), whose sum is σ = 70651728. Its totient is φ = 10644480.

The previous prime is 27997421. The next prime is 27997481. The reversal of 27997424 is 42479972.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997421) 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 23 ways as a sum of consecutive naturals, for example, 417839 + ... + 417905.

Almost surely, 2^27997424 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 27997424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35325864).

27997424 is an abundant number, since it is smaller than the sum of its proper divisors (42654304).

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

27997424 is a wasteful number, since it uses less digits than its factorization.

27997424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 130 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 27997424 is about 5291.2592074099. The cubic root of 27997424 is about 303.6495846958.

The spelling of 27997424 in words is "twenty-seven million, nine hundred ninety-seven thousand, four hundred twenty-four".