28817899 has 4 divisors (see below), whose sum is σ = 31437720. Its totient is φ = 26198080.

The previous prime is 28817863. The next prime is 28817917. The reversal of 28817899 is 99871882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28817899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28817809) 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, 1309894 + ... + 1309915.

It is an arithmetic number, because the mean of its divisors is an integer number (7859430).

Almost surely, 2^28817899 is an apocalyptic number.

28817899 is a deficient number, since it is larger than the sum of its proper divisors (2619821).

28817899 is a wasteful number, since it uses less digits than its factorization.

28817899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619820.

The product of its digits is 580608, while the sum is 52.

The square root of 28817899 is about 5368.2305278369. The cubic root of 28817899 is about 306.5872606056.

The spelling of 28817899 in words is "twenty-eight million, eight hundred seventeen thousand, eight hundred ninety-nine".