27840816 has 60 divisors (see below), whose sum is σ = 78272272. Its totient is φ = 9237888.

The previous prime is 27840811. The next prime is 27840863. The reversal of 27840816 is 61804872.

It is a super-2 number, since 2×27840816² = 1550222071091712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (27840811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56925 + ... + 57411.

Almost surely, 2^27840816 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 27840816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39136136).

27840816 is an abundant number, since it is smaller than the sum of its proper divisors (50431456).

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

27840816 is a wasteful number, since it uses less digits than its factorization.

27840816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 27840816 is about 5276.4397087430. The cubic root of 27840816 is about 303.0823551586.

The spelling of 27840816 in words is "twenty-seven million, eight hundred forty thousand, eight hundred sixteen".