42578 has 8 divisors (see below), whose sum is σ = 65100. Its totient is φ = 20880.

The previous prime is 42577. The next prime is 42589. The reversal of 42578 is 87524.

It can be written as a sum of positive squares in 2 ways, for example, as 41209 + 1369 = 203^2 + 37^2 .

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

It is an Ulam number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (42571) 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, 53 + ... + 296.

2⁴²⁵⁷⁸ is an apocalyptic number.

42578 is a deficient number, since it is larger than the sum of its proper divisors (22522).

42578 is a wasteful number, since it uses less digits than its factorization.

42578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412.

The product of its digits is 2240, while the sum is 26.

The square root of 42578 is about 206.3443723488. The cubic root of 42578 is about 34.9189963440.

The spelling of 42578 in words is "forty-two thousand, five hundred seventy-eight".