528305999 has 16 divisors (see below), whose sum is σ = 590849280. Its totient is φ = 471875040.

The previous prime is 528305989. The next prime is 528306007. The reversal of 528305999 is 999503825.

It is a de Polignac number, because none of the positive numbers 2^k-528305999 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 (528305989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64229 + ... + 71985.

It is an arithmetic number, because the mean of its divisors is an integer number (36928080).

Almost surely, 2^528305999 is an apocalyptic number.

528305999 is a deficient number, since it is larger than the sum of its proper divisors (62543281).

528305999 is an equidigital number, since it uses as much as digits as its factorization.

528305999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7827 (or 7801 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 50.

The square root of 528305999 is about 22984.9080702969. The cubic root of 528305999 is about 808.4041122799.

The spelling of 528305999 in words is "five hundred twenty-eight million, three hundred five thousand, nine hundred ninety-nine".