320780 has 24 divisors (see below), whose sum is σ = 691152. Its totient is φ = 124992.

The previous prime is 320767. The next prime is 320791. The reversal of 320780 is 87023.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a plaindrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (28798).

2³²⁰⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345576).

320780 is an abundant number, since it is smaller than the sum of its proper divisors (370372).

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

320780 is a wasteful number, since it uses less digits than its factorization.

320780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 320780 is about 566.3744344513. The cubic root of 320780 is about 68.4545669923.

The spelling of 320780 in words is "three hundred twenty thousand, seven hundred eighty".