245778 has 32 divisors (see below), whose sum is σ = 556416. Its totient is φ = 71808.

The previous prime is 245771. The next prime is 245783. The reversal of 245778 is 877542.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (245771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1726 + ... + 1862.

It is an arithmetic number, because the mean of its divisors is an integer number (17388).

2²⁴⁵⁷⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278208).

245778 is an abundant number, since it is smaller than the sum of its proper divisors (310638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

245778 is a wasteful number, since it uses less digits than its factorization.

245778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178.

The product of its digits is 15680, while the sum is 33.

The square root of 245778 is about 495.7600225916. The cubic root of 245778 is about 62.6394114665.

The spelling of 245778 in words is "two hundred forty-five thousand, seven hundred seventy-eight".