27409945 has 4 divisors (see below), whose sum is σ = 32891940. Its totient is φ = 21927952.

The previous prime is 27409937. The next prime is 27409999. The reversal of 27409945 is 54990472.

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 7096896 + 20313049 = 2664^2 + 4507^2 .

It is a cyclic number.

It is not a de Polignac number, because 27409945 - 2³ = 27409937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27409898 and 27409907.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2740990 + ... + 2740999.

It is an arithmetic number, because the mean of its divisors is an integer number (8222985).

Almost surely, 2^27409945 is an apocalyptic number.

It is an amenable number.

27409945 is a deficient number, since it is larger than the sum of its proper divisors (5481995).

27409945 is an equidigital number, since it uses as much as digits as its factorization.

27409945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481994.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 27409945 is about 5235.4507924342. The cubic root of 27409945 is about 301.5106947171.

The spelling of 27409945 in words is "twenty-seven million, four hundred nine thousand, nine hundred forty-five".