201578 has 8 divisors (see below), whose sum is σ = 325668. Its totient is φ = 93024.

The previous prime is 201577. The next prime is 201581. The reversal of 201578 is 875102.

201578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 196249 + 5329 = 443^2 + 73^2 .

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

It is not an unprimeable number, because it can be changed into a prime (201577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3851 + ... + 3902.

2²⁰¹⁵⁷⁸ is an apocalyptic number.

201578 is a deficient number, since it is larger than the sum of its proper divisors (124090).

201578 is a wasteful number, since it uses less digits than its factorization.

201578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7768.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 201578 is about 448.9743867973. The cubic root of 201578 is about 58.6337553583.

Adding to 201578 its sum of digits (23), we get a square (201601 = 449²).

The spelling of 201578 in words is "two hundred one thousand, five hundred seventy-eight".