28869427 has 4 divisors (see below), whose sum is σ = 28884240. Its totient is φ = 28854616.

The previous prime is 28869403. The next prime is 28869433. The reversal of 28869427 is 72496882.

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 28869427 - 2¹¹ = 28867379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28869437) 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, 3943 + ... + 8560.

It is an arithmetic number, because the mean of its divisors is an integer number (7221060).

Almost surely, 2^28869427 is an apocalyptic number.

28869427 is a deficient number, since it is larger than the sum of its proper divisors (14813).

28869427 is a wasteful number, since it uses less digits than its factorization.

28869427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14812.

The product of its digits is 387072, while the sum is 46.

The square root of 28869427 is about 5373.0277311773. The cubic root of 28869427 is about 306.7698834715.

The spelling of 28869427 in words is "twenty-eight million, eight hundred sixty-nine thousand, four hundred twenty-seven".