27472405 has 4 divisors (see below), whose sum is σ = 32966892. Its totient is φ = 21977920.

The previous prime is 27472397. The next prime is 27472409. The reversal of 27472405 is 50427472.

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 12895281 + 14577124 = 3591^2 + 3818^2 .

It is not a de Polignac number, because 27472405 - 2³ = 27472397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27472409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2747236 + ... + 2747245.

It is an arithmetic number, because the mean of its divisors is an integer number (8241723).

Almost surely, 2^27472405 is an apocalyptic number.

It is an amenable number.

27472405 is a deficient number, since it is larger than the sum of its proper divisors (5494487).

27472405 is an equidigital number, since it uses as much as digits as its factorization.

27472405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5494486.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 27472405 is about 5241.4125004621. The cubic root of 27472405 is about 301.7395419649.

Adding to 27472405 its reverse (50427472), we get a palindrome (77899877).

The spelling of 27472405 in words is "twenty-seven million, four hundred seventy-two thousand, four hundred five".