28717999 has 8 divisors (see below), whose sum is σ = 29494080. Its totient is φ = 27945600.

The previous prime is 28717993. The next prime is 28718017. The reversal of 28717999 is 99971782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28717999 - 2¹⁷ = 28586927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22714 + ... + 23944.

It is an arithmetic number, because the mean of its divisors is an integer number (3686760).

Almost surely, 2^28717999 is an apocalyptic number.

28717999 is a deficient number, since it is larger than the sum of its proper divisors (776081).

28717999 is a wasteful number, since it uses less digits than its factorization.

28717999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841.

The product of its digits is 571536, while the sum is 52.

The square root of 28717999 is about 5358.9177078959. The cubic root of 28717999 is about 306.2325791007.

The spelling of 28717999 in words is "twenty-eight million, seven hundred seventeen thousand, nine hundred ninety-nine".