780440 has 32 divisors (see below), whose sum is σ = 1782000. Its totient is φ = 307584.

The previous prime is 780433. The next prime is 780457. The reversal of 780440 is 44087.

780440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 4271 + ... + 4449.

2⁷⁸⁰⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

780440 is an abundant number, since it is smaller than the sum of its proper divisors (1001560).

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

780440 is a wasteful number, since it uses less digits than its factorization.

780440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 780440 is about 883.4251524606. The cubic root of 780440 is about 92.0689464271.

The spelling of 780440 in words is "seven hundred eighty thousand, four hundred forty".