27859897 has 4 divisors (see below), whose sum is σ = 30002980. Its totient is φ = 25716816.

The previous prime is 27859891. The next prime is 27859907. The reversal of 27859897 is 79895872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17943696 + 9916201 = 4236^2 + 3149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27859897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27859891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071522 + ... + 1071547.

It is an arithmetic number, because the mean of its divisors is an integer number (7500745).

Almost surely, 2^27859897 is an apocalyptic number.

It is an amenable number.

27859897 is a deficient number, since it is larger than the sum of its proper divisors (2143083).

27859897 is a wasteful number, since it uses less digits than its factorization.

27859897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143082.

The product of its digits is 2540160, while the sum is 55.

The square root of 27859897 is about 5278.2475311414. The cubic root of 27859897 is about 303.1515795873.

The spelling of 27859897 in words is "twenty-seven million, eight hundred fifty-nine thousand, eight hundred ninety-seven".