27905969 has 32 divisors (see below), whose sum is σ = 36556800. Its totient is φ = 20699712.

The previous prime is 27905963. The next prime is 27905971. The reversal of 27905969 is 96950972.

It is a cyclic number.

It is not a de Polignac number, because 27905969 - 2¹² = 27901873 is a prime.

It is a super-2 number, since 2×27905969² = 1557486211657922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27905963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140132 + ... + 140330.

It is an arithmetic number, because the mean of its divisors is an integer number (1142400).

Almost surely, 2^27905969 is an apocalyptic number.

It is an amenable number.

27905969 is a deficient number, since it is larger than the sum of its proper divisors (8650831).

27905969 is a wasteful number, since it uses less digits than its factorization.

27905969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 27905969 is about 5282.6100556448. The cubic root of 27905969 is about 303.3185951325.

The spelling of 27905969 in words is "twenty-seven million, nine hundred five thousand, nine hundred sixty-nine".