780320 has 24 divisors (see below), whose sum is σ = 1843884. Its totient is φ = 312064.

The previous prime is 780287. The next prime is 780323. The reversal of 780320 is 23087.

It can be written as a sum of positive squares in 2 ways, for example, as 753424 + 26896 = 868^2 + 164^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 780292 and 780301.

It is not an unprimeable number, because it can be changed into a prime (780323) 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, 2279 + ... + 2598.

2⁷⁸⁰³²⁰ is an apocalyptic number.

It is an amenable number.

780320 is an abundant number, since it is smaller than the sum of its proper divisors (1063564).

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

780320 is a wasteful number, since it uses less digits than its factorization.

780320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892 (or 4884 counting only the distinct ones).

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

The square root of 780320 is about 883.3572323811. The cubic root of 780320 is about 92.0642273627.

The spelling of 780320 in words is "seven hundred eighty thousand, three hundred twenty".