27780225 has 48 divisors (see below), whose sum is σ = 50663424. Its totient is φ = 13320000.

The previous prime is 27780217. The next prime is 27780281. The reversal of 27780225 is 52208772.

It is not a de Polignac number, because 27780225 - 2³ = 27780217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124464 + ... + 124686.

It is an arithmetic number, because the mean of its divisors is an integer number (1055488).

Almost surely, 2^27780225 is an apocalyptic number.

27780225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27780225 is a deficient number, since it is larger than the sum of its proper divisors (22883199).

27780225 is a wasteful number, since it uses less digits than its factorization.

27780225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 27780225 is about 5270.6949257190. The cubic root of 27780225 is about 302.8623256733.

Adding to 27780225 its reverse (52208772), we get a palindrome (79988997).

The spelling of 27780225 in words is "twenty-seven million, seven hundred eighty thousand, two hundred twenty-five".