245780 has 12 divisors (see below), whose sum is σ = 516180. Its totient is φ = 98304.

The previous prime is 245771. The next prime is 245783. The reversal of 245780 is 87542.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 99856 = 382^2 + 316^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245783) by changing a digit.

245780 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 in 3 ways as a sum of consecutive naturals, for example, 6125 + ... + 6164.

It is an arithmetic number, because the mean of its divisors is an integer number (43015).

2²⁴⁵⁷⁸⁰ is an apocalyptic number.

245780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245780 is an abundant number, since it is smaller than the sum of its proper divisors (270400).

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

245780 is a wasteful number, since it uses less digits than its factorization.

245780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12298 (or 12296 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 245780 is about 495.7620396924. The cubic root of 245780 is about 62.6395813739.

The spelling of 245780 in words is "two hundred forty-five thousand, seven hundred eighty".