27783378 has 64 divisors (see below), whose sum is σ = 72867840. Its totient is φ = 7678800.

The previous prime is 27783373. The next prime is 27783391. The reversal of 27783378 is 87338772.

27783378 is a `hidden beast` number, since 277 + 8 + 3 + 378 = 666.

It is not an unprimeable number, because it can be changed into a prime (27783373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10533 + ... + 12903.

It is an arithmetic number, because the mean of its divisors is an integer number (1138560).

Almost surely, 2^27783378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27783378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36433920).

27783378 is an abundant number, since it is smaller than the sum of its proper divisors (45084462).

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

27783378 is a wasteful number, since it uses less digits than its factorization.

27783378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420 (or 2414 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 27783378 is about 5270.9940239010. The cubic root of 27783378 is about 302.8737833293.

The spelling of 27783378 in words is "twenty-seven million, seven hundred eighty-three thousand, three hundred seventy-eight".