87445 has 4 divisors (see below), whose sum is σ = 104940. Its totient is φ = 69952.

The previous prime is 87443. The next prime is 87473. The reversal of 87445 is 54478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54478 = 2 ⋅27239.

It can be written as a sum of positive squares in 2 ways, for example, as 9604 + 77841 = 98^2 + 279^2 .

It is a cyclic number.

It is not a de Polignac number, because 87445 - 2¹ = 87443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87443) 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, 8740 + ... + 8749.

It is an arithmetic number, because the mean of its divisors is an integer number (26235).

2⁸⁷⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

87445 is a deficient number, since it is larger than the sum of its proper divisors (17495).

87445 is a wasteful number, since it uses less digits than its factorization.

87445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17494.

The product of its digits is 4480, while the sum is 28.

The square root of 87445 is about 295.7110075733. The cubic root of 87445 is about 44.3858962860.

It can be divided in two parts, 874 and 45, that added together give a palindrome (919).

The spelling of 87445 in words is "eighty-seven thousand, four hundred forty-five".