27780449 has 4 divisors (see below), whose sum is σ = 27983364. Its totient is φ = 27577536.

The previous prime is 27780419. The next prime is 27780457. The reversal of 27780449 is 94408772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14326225 + 13454224 = 3785^2 + 3668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27780449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27780419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101252 + ... + 101525.

It is an arithmetic number, because the mean of its divisors is an integer number (6995841).

Almost surely, 2^27780449 is an apocalyptic number.

It is an amenable number.

27780449 is a deficient number, since it is larger than the sum of its proper divisors (202915).

27780449 is a wasteful number, since it uses less digits than its factorization.

27780449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202914.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 27780449 is about 5270.7161752460. The cubic root of 27780449 is about 302.8631396933.

The spelling of 27780449 in words is "twenty-seven million, seven hundred eighty thousand, four hundred forty-nine".