245578 has 4 divisors (see below), whose sum is σ = 368370. Its totient is φ = 122788.

The previous prime is 245563. The next prime is 245587. The reversal of 245578 is 875542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875542 = 2 ⋅437771.

It can be written as a sum of positive squares in only one way, i.e., 134689 + 110889 = 367^2 + 333^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 10.

It is an unprimeable number.

245578 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61393 + ... + 61396.

2²⁴⁵⁵⁷⁸ is an apocalyptic number.

245578 is a deficient number, since it is larger than the sum of its proper divisors (122792).

245578 is a wasteful number, since it uses less digits than its factorization.

245578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122791.

The product of its digits is 11200, while the sum is 31.

The square root of 245578 is about 495.5582710439. The cubic root of 245578 is about 62.6224160723.

The spelling of 245578 in words is "two hundred forty-five thousand, five hundred seventy-eight".