27121865 has 8 divisors (see below), whose sum is σ = 32762688. Its totient is φ = 21553200.

The previous prime is 27121811. The next prime is 27121889. The reversal of 27121865 is 56812172.

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

It is not a de Polignac number, because 27121865 - 2⁸ = 27121609 is a prime.

It is a super-2 number, since 2×27121865² = 1471191122156450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17207 + ... + 18716.

It is an arithmetic number, because the mean of its divisors is an integer number (4095336).

Almost surely, 2^27121865 is an apocalyptic number.

It is an amenable number.

27121865 is a deficient number, since it is larger than the sum of its proper divisors (5640823).

27121865 is a wasteful number, since it uses less digits than its factorization.

27121865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36079.

The product of its digits is 6720, while the sum is 32.

The square root of 27121865 is about 5207.8656856720. The cubic root of 27121865 is about 300.4506744879.

The spelling of 27121865 in words is "twenty-seven million, one hundred twenty-one thousand, eight hundred sixty-five".