75639 has 8 divisors (see below), whose sum is σ = 106240. Its totient is φ = 47736.

The previous prime is 75629. The next prime is 75641. The reversal of 75639 is 93657.

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

It is not a de Polignac number, because 75639 - 2⁷ = 75511 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75619) 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 7 ways as a sum of consecutive naturals, for example, 607 + ... + 720.

It is an arithmetic number, because the mean of its divisors is an integer number (13280).

2⁷⁵⁶³⁹ is an apocalyptic number.

75639 is a deficient number, since it is larger than the sum of its proper divisors (30601).

75639 is a wasteful number, since it uses less digits than its factorization.

75639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349.

The product of its digits is 5670, while the sum is 30.

The square root of 75639 is about 275.0254533675. The cubic root of 75639 is about 42.2910621649.

The spelling of 75639 in words is "seventy-five thousand, six hundred thirty-nine".