27128905 has 8 divisors (see below), whose sum is σ = 32755392. Its totient is φ = 21569328.

The previous prime is 27128897. The next prime is 27128909. The reversal of 27128905 is 50982172.

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 27128905 - 2³ = 27128897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27128909) 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, 15829 + ... + 17458.

It is an arithmetic number, because the mean of its divisors is an integer number (4094424).

Almost surely, 2^27128905 is an apocalyptic number.

It is an amenable number.

27128905 is a deficient number, since it is larger than the sum of its proper divisors (5626487).

27128905 is a wasteful number, since it uses less digits than its factorization.

27128905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33455.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 27128905 is about 5208.5415425050. The cubic root of 27128905 is about 300.4766681497.

The spelling of 27128905 in words is "twenty-seven million, one hundred twenty-eight thousand, nine hundred five".