27918440 has 64 divisors (see below), whose sum is σ = 69284160. Its totient is φ = 10040320.

The previous prime is 27918427. The next prime is 27918463. The reversal of 27918440 is 4481972.

It is a self number, because there is not a number n which added to its sum of digits gives 27918440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46784 + ... + 47376.

It is an arithmetic number, because the mean of its divisors is an integer number (1082565).

Almost surely, 2^27918440 is an apocalyptic number.

27918440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27918440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34642080).

27918440 is an abundant number, since it is smaller than the sum of its proper divisors (41365720).

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

27918440 is a wasteful number, since it uses less digits than its factorization.

27918440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 27918440 is about 5283.7903062101. The cubic root of 27918440 is about 303.3637721202.

The spelling of 27918440 in words is "twenty-seven million, nine hundred eighteen thousand, four hundred forty".