135578 has 4 divisors (see below), whose sum is σ = 203370. Its totient is φ = 67788.

The previous prime is 135571. The next prime is 135581. The reversal of 135578 is 875531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875531 = 37 ⋅23663.

It can be written as a sum of positive squares in only one way, i.e., 85849 + 49729 = 293^2 + 223^2 .

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 135578.

It is not an unprimeable number, because it can be changed into a prime (135571) 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 as a sum of consecutive naturals, namely, 33893 + ... + 33896.

2¹³⁵⁵⁷⁸ is an apocalyptic number.

135578 is a deficient number, since it is larger than the sum of its proper divisors (67792).

135578 is an equidigital number, since it uses as much as digits as its factorization.

135578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67791.

The product of its digits is 4200, while the sum is 29.

The square root of 135578 is about 368.2091796792. The cubic root of 135578 is about 51.3723864659.

The spelling of 135578 in words is "one hundred thirty-five thousand, five hundred seventy-eight".