85784 has 8 divisors (see below), whose sum is σ = 160860. Its totient is φ = 42888.

The previous prime is 85781. The next prime is 85793. The reversal of 85784 is 48758.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 85784.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5354 + ... + 5369.

2⁸⁵⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

85784 is a deficient number, since it is larger than the sum of its proper divisors (75076).

85784 is a wasteful number, since it uses less digits than its factorization.

85784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10729 (or 10725 counting only the distinct ones).

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

The square root of 85784 is about 292.8890574945. The cubic root of 85784 is about 44.1030641824.

The spelling of 85784 in words is "eighty-five thousand, seven hundred eighty-four".