245678 has 4 divisors (see below), whose sum is σ = 368520. Its totient is φ = 122838.

The previous prime is 245671. The next prime is 245681. The reversal of 245678 is 876542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 876542 = 2 ⋅438271.

It is a d-powerful number, because it can be written as 2¹⁷ + 4⁸ + 6⁶ + 5 + 7⁴ + 8 .

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245671) by changing a digit.

245678 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, 61418 + ... + 61421.

It is an arithmetic number, because the mean of its divisors is an integer number (92130).

2²⁴⁵⁶⁷⁸ is an apocalyptic number.

245678 is a deficient number, since it is larger than the sum of its proper divisors (122842).

245678 is a wasteful number, since it uses less digits than its factorization.

245678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122841.

The product of its digits is 13440, while the sum is 32.

The square root of 245678 is about 495.6591570828. The cubic root of 245678 is about 62.6309149224.

The spelling of 245678 in words is "two hundred forty-five thousand, six hundred seventy-eight".