27078640 has 40 divisors (see below), whose sum is σ = 64036080. Its totient is φ = 10646016.

The previous prime is 27078607. The next prime is 27078641. The reversal of 27078640 is 4687072.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 27078596 and 27078605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27078641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1852 + ... + 7588.

It is an arithmetic number, because the mean of its divisors is an integer number (1600902).

Almost surely, 2^27078640 is an apocalyptic number.

27078640 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 27078640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32018040).

27078640 is an abundant number, since it is smaller than the sum of its proper divisors (36957440).

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

27078640 is a wasteful number, since it uses less digits than its factorization.

27078640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809 (or 5803 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 27078640 is about 5203.7140582472. The cubic root of 27078640 is about 300.2909769427.

The spelling of 27078640 in words is "twenty-seven million, seventy-eight thousand, six hundred forty".