780280 has 16 divisors (see below), whose sum is σ = 1755720. Its totient is φ = 312096.

The previous prime is 780257. The next prime is 780287. The reversal of 780280 is 82087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780287) 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, 9714 + ... + 9793.

2⁷⁸⁰²⁸⁰ is an apocalyptic number.

It is an amenable number.

780280 is an abundant number, since it is smaller than the sum of its proper divisors (975440).

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

780280 is a wasteful number, since it uses less digits than its factorization.

780280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19518 (or 19514 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 780280 is about 883.3345911941. The cubic root of 780280 is about 92.0626542337.

The spelling of 780280 in words is "seven hundred eighty thousand, two hundred eighty".