528704009 has 4 divisors (see below), whose sum is σ = 529960260. Its totient is φ = 527447760.

The previous prime is 528703997. The next prime is 528704021. The reversal of 528704009 is 900407825.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (528703997) and next prime (528704021).

It can be written as a sum of positive squares in 2 ways, for example, as 17808400 + 510895609 = 4220^2 + 22603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-528704009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 528704009.

It is not an unprimeable number, because it can be changed into a prime (528764009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627494 + ... + 628335.

It is an arithmetic number, because the mean of its divisors is an integer number (132490065).

Almost surely, 2^528704009 is an apocalyptic number.

It is an amenable number.

528704009 is a deficient number, since it is larger than the sum of its proper divisors (1256251).

528704009 is a wasteful number, since it uses less digits than its factorization.

528704009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256250.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 528704009 is about 22993.5645127066. The cubic root of 528704009 is about 808.6070705121.

The spelling of 528704009 in words is "five hundred twenty-eight million, seven hundred four thousand, nine".