245680 has 40 divisors (see below), whose sum is σ = 593712. Its totient is φ = 94464.

The previous prime is 245671. The next prime is 245681. The reversal of 245680 is 86542.

It is a tau number, because it is divible by the number of its divisors (40).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (245681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2919 + ... + 3001.

2²⁴⁵⁶⁸⁰ is an apocalyptic number.

245680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296856).

245680 is an abundant number, since it is smaller than the sum of its proper divisors (348032).

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

245680 is a wasteful number, since it uses less digits than its factorization.

245680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 245680 is about 495.6611745941. The cubic root of 245680 is about 62.6310848759.

The spelling of 245680 in words is "two hundred forty-five thousand, six hundred eighty".