87845 has 4 divisors (see below), whose sum is σ = 105420. Its totient is φ = 70272.

The previous prime is 87833. The next prime is 87853. The reversal of 87845 is 54878.

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 12769 + 75076 = 113^2 + 274^2 .

It is a cyclic number.

It is not a de Polignac number, because 87845 - 2⁸ = 87589 is a prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8780 + ... + 8789.

It is an arithmetic number, because the mean of its divisors is an integer number (26355).

2⁸⁷⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

87845 is a deficient number, since it is larger than the sum of its proper divisors (17575).

87845 is a wasteful number, since it uses less digits than its factorization.

87845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17574.

The product of its digits is 8960, while the sum is 32.

The square root of 87845 is about 296.3865718956. The cubic root of 87845 is about 44.4534715460.

The spelling of 87845 in words is "eighty-seven thousand, eight hundred forty-five".