28817867 has 4 divisors (see below), whose sum is σ = 31034640. Its totient is φ = 26601096.

The previous prime is 28817863. The next prime is 28817917. The reversal of 28817867 is 76871882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76871882 = 2 ⋅38435941.

It is a cyclic number.

It is not a de Polignac number, because 28817867 - 2² = 28817863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28817863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108367 + ... + 1108392.

It is an arithmetic number, because the mean of its divisors is an integer number (7758660).

Almost surely, 2^28817867 is an apocalyptic number.

28817867 is a deficient number, since it is larger than the sum of its proper divisors (2216773).

28817867 is a wasteful number, since it uses less digits than its factorization.

28817867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216772.

The product of its digits is 301056, while the sum is 47.

The square root of 28817867 is about 5368.2275473381. The cubic root of 28817867 is about 306.5871471253.

The spelling of 28817867 in words is "twenty-eight million, eight hundred seventeen thousand, eight hundred sixty-seven".