305780 has 12 divisors (see below), whose sum is σ = 642180. Its totient is φ = 122304.

The previous prime is 305771. The next prime is 305783. The reversal of 305780 is 87503.

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 155236 = 388^2 + 394^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7625 + ... + 7664.

It is an arithmetic number, because the mean of its divisors is an integer number (53515).

2³⁰⁵⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

305780 is an abundant number, since it is smaller than the sum of its proper divisors (336400).

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

305780 is a wasteful number, since it uses less digits than its factorization.

305780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15298 (or 15296 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 305780 is about 552.9737787635. The cubic root of 305780 is about 67.3704878324.

The spelling of 305780 in words is "three hundred five thousand, seven hundred eighty".