27921408 has 88 divisors (see below), whose sum is σ = 76148400. Its totient is φ = 9093120.

The previous prime is 27921391. The next prime is 27921409. The reversal of 27921408 is 80412972.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (27921409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187318 + ... + 187466.

Almost surely, 2^27921408 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 27921408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38074200).

27921408 is an abundant number, since it is smaller than the sum of its proper divisors (48226992).

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

27921408 is a wasteful number, since it uses less digits than its factorization.

27921408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 27921408 is about 5284.0711577343. The cubic root of 27921408 is about 303.3745219063.

The spelling of 27921408 in words is "twenty-seven million, nine hundred twenty-one thousand, four hundred eight".