28707999 has 8 divisors (see below), whose sum is σ = 39597360. Its totient is φ = 18478656.

The previous prime is 28707997. The next prime is 28708007. The reversal of 28707999 is 99970782.

It is a happy number.

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

It is not a de Polignac number, because 28707999 - 2¹ = 28707997 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28707997) 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, 164902 + ... + 165075.

It is an arithmetic number, because the mean of its divisors is an integer number (4949670).

Almost surely, 2^28707999 is an apocalyptic number.

28707999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28707999 is a deficient number, since it is larger than the sum of its proper divisors (10889361).

28707999 is a wasteful number, since it uses less digits than its factorization.

28707999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330009.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 28707999 is about 5357.9846024415. The cubic root of 28707999 is about 306.1970301834.

The spelling of 28707999 in words is "twenty-eight million, seven hundred seven thousand, nine hundred ninety-nine".