27145780 has 24 divisors (see below), whose sum is σ = 57790152. Its totient is φ = 10708992.

The previous prime is 27145777. The next prime is 27145817. The reversal of 27145780 is 8754172.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4048144 + 23097636 = 2012^2 + 4806^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 7837 + ... + 10756.

It is an arithmetic number, because the mean of its divisors is an integer number (2407923).

Almost surely, 2^27145780 is an apocalyptic number.

27145780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27145780 is an abundant number, since it is smaller than the sum of its proper divisors (30644372).

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

27145780 is a wasteful number, since it uses less digits than its factorization.

27145780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18675 (or 18673 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 27145780 is about 5210.1612259123. The cubic root of 27145780 is about 300.5389570969.

The spelling of 27145780 in words is "twenty-seven million, one hundred forty-five thousand, seven hundred eighty".