27012780 has 144 divisors (see below), whose sum is σ = 87220224. Its totient is φ = 6756480.

The previous prime is 27012767. The next prime is 27012841. The reversal of 27012780 is 8721072.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 262209 + ... + 262311.

It is an arithmetic number, because the mean of its divisors is an integer number (605696).

Almost surely, 2^27012780 is an apocalyptic number.

27012780 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 27012780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43610112).

27012780 is an abundant number, since it is smaller than the sum of its proper divisors (60207444).

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

27012780 is a wasteful number, since it uses less digits than its factorization.

27012780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 27012780 is about 5197.3820332933. The cubic root of 27012780 is about 300.0473258671.

The spelling of 27012780 in words is "twenty-seven million, twelve thousand, seven hundred eighty".