27420905 has 8 divisors (see below), whose sum is σ = 32934600. Its totient is φ = 21917056.

The previous prime is 27420893. The next prime is 27420907. The reversal of 27420905 is 50902472.

It can be written as a sum of positive squares in 4 ways, for example, as 929296 + 26491609 = 964^2 + 5147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27420905 - 2¹⁰ = 27419881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27420907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6941 + ... + 10149.

It is an arithmetic number, because the mean of its divisors is an integer number (4116825).

Almost surely, 2^27420905 is an apocalyptic number.

It is an amenable number.

27420905 is a deficient number, since it is larger than the sum of its proper divisors (5513695).

27420905 is a wasteful number, since it uses less digits than its factorization.

27420905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 27420905 is about 5236.4973980706. The cubic root of 27420905 is about 301.5508762019.

The spelling of 27420905 in words is "twenty-seven million, four hundred twenty thousand, nine hundred five".