52578209 has 4 divisors (see below), whose sum is σ = 52592916. Its totient is φ = 52563504.

The previous prime is 52578199. The next prime is 52578233. The reversal of 52578209 is 90287525.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 37149025 + 15429184 = 6095^2 + 3928^2 .

It is a cyclic number.

It is not a de Polignac number, because 52578209 - 2⁴ = 52578193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52571209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847 + ... + 10419.

It is an arithmetic number, because the mean of its divisors is an integer number (13148229).

Almost surely, 2^52578209 is an apocalyptic number.

It is an amenable number.

52578209 is a deficient number, since it is larger than the sum of its proper divisors (14707).

52578209 is an equidigital number, since it uses as much as digits as its factorization.

52578209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14706.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 52578209 is about 7251.0832983769. The cubic root of 52578209 is about 374.6294627337.

The spelling of 52578209 in words is "fifty-two million, five hundred seventy-eight thousand, two hundred nine".