57445 has 4 divisors (see below), whose sum is σ = 68940. Its totient is φ = 45952.

The previous prime is 57427. The next prime is 57457. The reversal of 57445 is 54475.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16641 + 40804 = 129^2 + 202^2 .

It is a cyclic number.

It is not a de Polignac number, because 57445 - 2⁵ = 57413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5740 + ... + 5749.

It is an arithmetic number, because the mean of its divisors is an integer number (17235).

2⁵⁷⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

57445 is a deficient number, since it is larger than the sum of its proper divisors (11495).

57445 is a wasteful number, since it uses less digits than its factorization.

57445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11494.

The product of its digits is 2800, while the sum is 25.

The square root of 57445 is about 239.6768658006. The cubic root of 57445 is about 38.5849028631.

Subtracting from 57445 its product of digits (2800), we obtain a palindrome (54645).

The spelling of 57445 in words is "fifty-seven thousand, four hundred forty-five".