28697171 has 4 divisors (see below), whose sum is σ = 29397144. Its totient is φ = 27997200.

The previous prime is 28697147. The next prime is 28697183. The reversal of 28697171 is 17179682.

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

It is a cyclic number.

It is not a de Polignac number, because 28697171 - 2⁶ = 28697107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 699931 = 28697171 / (2 + 8 + 6 + 9 + 7 + 1 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28697131) 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, 349925 + ... + 350006.

It is an arithmetic number, because the mean of its divisors is an integer number (7349286).

Almost surely, 2^28697171 is an apocalyptic number.

28697171 is a deficient number, since it is larger than the sum of its proper divisors (699973).

28697171 is an equidigital number, since it uses as much as digits as its factorization.

28697171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699972.

The product of its digits is 42336, while the sum is 41.

The square root of 28697171 is about 5356.9740525786. The cubic root of 28697171 is about 306.1585285058.

The spelling of 28697171 in words is "twenty-eight million, six hundred ninety-seven thousand, one hundred seventy-one".