27780105 has 16 divisors (see below), whose sum is σ = 44561664. Its totient is φ = 14778240.

The previous prime is 27780097. The next prime is 27780127. The reversal of 27780105 is 50108772.

It is a happy number.

It is not a de Polignac number, because 27780105 - 2³ = 27780097 is a prime.

It is a super-2 number, since 2×27780105² = 1543468467622050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4317 + ... + 8613.

It is an arithmetic number, because the mean of its divisors is an integer number (2785104).

Almost surely, 2^27780105 is an apocalyptic number.

It is an amenable number.

27780105 is a deficient number, since it is larger than the sum of its proper divisors (16781559).

27780105 is a wasteful number, since it uses less digits than its factorization.

27780105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 27780105 is about 5270.6835420086. The cubic root of 27780105 is about 302.8618895894.

Adding to 27780105 its reverse (50108772), we get a palindrome (77888877).

The spelling of 27780105 in words is "twenty-seven million, seven hundred eighty thousand, one hundred five".