28897171 has 4 divisors (see below), whose sum is σ = 28908144. Its totient is φ = 28886200.

The previous prime is 28897163. The next prime is 28897201. The reversal of 28897171 is 17179882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28897171 - 2³ = 28897163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28897571) 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, 1101 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (7227036).

Almost surely, 2^28897171 is an apocalyptic number.

28897171 is a deficient number, since it is larger than the sum of its proper divisors (10973).

28897171 is an equidigital number, since it uses as much as digits as its factorization.

28897171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10972.

The product of its digits is 56448, while the sum is 43.

The square root of 28897171 is about 5375.6088957438. The cubic root of 28897171 is about 306.8681223303.

The spelling of 28897171 in words is "twenty-eight million, eight hundred ninety-seven thousand, one hundred seventy-one".