27381780 has 48 divisors (see below), whose sum is σ = 85189440. Its totient is φ = 7301664.

The previous prime is 27381769. The next prime is 27381787. The reversal of 27381780 is 8718372.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27381787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24814 + ... + 25893.

It is an arithmetic number, because the mean of its divisors is an integer number (1774780).

Almost surely, 2^27381780 is an apocalyptic number.

27381780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27381780 is an abundant number, since it is smaller than the sum of its proper divisors (57807660).

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

27381780 is a wasteful number, since it uses less digits than its factorization.

27381780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50725 (or 50717 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 27381780 is about 5232.7602658635. The cubic root of 27381780 is about 301.4073872128.

The spelling of 27381780 in words is "twenty-seven million, three hundred eighty-one thousand, seven hundred eighty".