28329999 has 4 divisors (see below), whose sum is σ = 37773336. Its totient is φ = 18886664.

The previous prime is 28329967. The next prime is 28330009. The reversal of 28329999 is 99992382.

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 28329999 - 2⁵ = 28329967 is a prime.

28329999 is a modest number, since divided by 9999 gives 2832 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28329919) 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, 4721664 + ... + 4721669.

It is an arithmetic number, because the mean of its divisors is an integer number (9443334).

Almost surely, 2^28329999 is an apocalyptic number.

28329999 is a deficient number, since it is larger than the sum of its proper divisors (9443337).

28329999 is an equidigital number, since it uses as much as digits as its factorization.

28329999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9443336.

The product of its digits is 629856, while the sum is 51.

The square root of 28329999 is about 5322.5932589293. The cubic root of 28329999 is about 304.8471831428.

Adding to 28329999 its product of digits (629856), we get a triangular number (28959855 = T₇₆₁₀).

The spelling of 28329999 in words is "twenty-eight million, three hundred twenty-nine thousand, nine hundred ninety-nine".