57639 has 4 divisors (see below), whose sum is σ = 76856. Its totient is φ = 38424.

The previous prime is 57637. The next prime is 57641. The reversal of 57639 is 93675.

57639 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 (57637) and next prime (57641).

It is not a de Polignac number, because 57639 - 2¹ = 57637 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9604 + ... + 9609.

It is an arithmetic number, because the mean of its divisors is an integer number (19214).

2⁵⁷⁶³⁹ is an apocalyptic number.

57639 is a deficient number, since it is larger than the sum of its proper divisors (19217).

57639 is a wasteful number, since it uses less digits than its factorization.

57639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19216.

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

The square root of 57639 is about 240.0812362514. The cubic root of 57639 is about 38.6282896414.

It can be divided in two parts, 57 and 639, that added together give a palindrome (696).

The spelling of 57639 in words is "fifty-seven thousand, six hundred thirty-nine".