27805965 has 64 divisors (see below), whose sum is σ = 53747712. Its totient is φ = 12108800.

The previous prime is 27805963. The next prime is 27805969. The reversal of 27805965 is 56950872.

It is not a de Polignac number, because 27805965 - 2¹ = 27805963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27805963) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64300 + ... + 64730.

It is an arithmetic number, because the mean of its divisors is an integer number (839808).

Almost surely, 2^27805965 is an apocalyptic number.

It is an amenable number.

27805965 is a deficient number, since it is larger than the sum of its proper divisors (25941747).

27805965 is a wasteful number, since it uses less digits than its factorization.

27805965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 27805965 is about 5273.1361636127. The cubic root of 27805965 is about 302.9558366724.

The spelling of 27805965 in words is "twenty-seven million, eight hundred five thousand, nine hundred sixty-five".