89785 has 4 divisors (see below), whose sum is σ = 107748. Its totient is φ = 71824.

The previous prime is 89783. The next prime is 89797. The reversal of 89785 is 58798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58798 = 2 ⋅29399.

It can be written as a sum of positive squares in 2 ways, for example, as 71289 + 18496 = 267^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 89785 - 2¹ = 89783 is a prime.

It is a super-2 number, since 2×89785² = 16122692450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89783) 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 3 ways as a sum of consecutive naturals, for example, 8974 + ... + 8983.

It is an arithmetic number, because the mean of its divisors is an integer number (26937).

2⁸⁹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

89785 is a deficient number, since it is larger than the sum of its proper divisors (17963).

89785 is a wasteful number, since it uses less digits than its factorization.

89785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17962.

The product of its digits is 20160, while the sum is 37.

The square root of 89785 is about 299.6414524060. The cubic root of 89785 is about 44.7783337517.

It can be divided in two parts, 897 and 85, that multiplied together give a triangular number (76245 = T₃₉₀).

The spelling of 89785 in words is "eighty-nine thousand, seven hundred eighty-five".