52639865 has 8 divisors (see below), whose sum is σ = 64360008. Its totient is φ = 41317120.

The previous prime is 52639831. The next prime is 52639877. The reversal of 52639865 is 56893625.

It is a happy number.

52639865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20241001 + 32398864 = 4499^2 + 5692^2 .

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

It is not a de Polignac number, because 52639865 - 2¹⁰ = 52638841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 99056 + ... + 99585.

It is an arithmetic number, because the mean of its divisors is an integer number (8045001).

Almost surely, 2^52639865 is an apocalyptic number.

It is an amenable number.

52639865 is a deficient number, since it is larger than the sum of its proper divisors (11720143).

52639865 is a wasteful number, since it uses less digits than its factorization.

52639865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198699.

The product of its digits is 388800, while the sum is 44.

The square root of 52639865 is about 7255.3335553922. Note that the first 3 decimals coincide. The cubic root of 52639865 is about 374.7758423319.

The spelling of 52639865 in words is "fifty-two million, six hundred thirty-nine thousand, eight hundred sixty-five".