99578 has 4 divisors (see below), whose sum is σ = 149370. Its totient is φ = 49788.

The previous prime is 99577. The next prime is 99581. The reversal of 99578 is 87599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87599 = 251 ⋅349.

It can be written as a sum of positive squares in only one way, i.e., 94249 + 5329 = 307^2 + 73^2 .

It is not an unprimeable number, because it can be changed into a prime (99571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24893 + ... + 24896.

2⁹⁹⁵⁷⁸ is an apocalyptic number.

99578 is a deficient number, since it is larger than the sum of its proper divisors (49792).

99578 is a wasteful number, since it uses less digits than its factorization.

99578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49791.

The product of its digits is 22680, while the sum is 38.

The square root of 99578 is about 315.5598200025. The cubic root of 99578 is about 46.3505045936.

The spelling of 99578 in words is "ninety-nine thousand, five hundred seventy-eight".