86578 has 8 divisors (see below), whose sum is σ = 131868. Its totient is φ = 42624.

The previous prime is 86573. The next prime is 86579. The reversal of 86578 is 87568.

It can be written as a sum of positive squares in 2 ways, for example, as 85849 + 729 = 293^2 + 27^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86573) by changing a digit.

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, 151 + ... + 442.

2⁸⁶⁵⁷⁸ is an apocalyptic number.

86578 is a deficient number, since it is larger than the sum of its proper divisors (45290).

86578 is a wasteful number, since it uses less digits than its factorization.

86578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its digits is 13440, while the sum is 34.

The square root of 86578 is about 294.2413974953. The cubic root of 86578 is about 44.2387163075.

Subtracting 86578 from its reverse (87568), we obtain a triangular number (990 = T₄₄).

The spelling of 86578 in words is "eighty-six thousand, five hundred seventy-eight".