780728 has 16 divisors (see below), whose sum is σ = 1576680. Its totient is φ = 360288.

The previous prime is 780721. The next prime is 780733. The reversal of 780728 is 827087.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 780694 and 780703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780721) 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, 3650 + ... + 3857.

2⁷⁸⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

780728 is an abundant number, since it is smaller than the sum of its proper divisors (795952).

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

780728 is a wasteful number, since it uses less digits than its factorization.

780728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7526 (or 7522 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 780728 is about 883.5881393500. The cubic root of 780728 is about 92.0802702083.

The spelling of 780728 in words is "seven hundred eighty thousand, seven hundred twenty-eight".