780928 has 16 divisors (see below), whose sum is σ = 1556010. Its totient is φ = 390400.

The previous prime is 780917. The next prime is 780931. The reversal of 780928 is 829087.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 153664 = 792^2 + 392^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 780893 and 780902.

It is an unprimeable number.

780928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2923 + ... + 3178.

2⁷⁸⁰⁹²⁸ is an apocalyptic number.

It is an amenable number.

780928 is a deficient number, since it is larger than the sum of its proper divisors (775082).

780928 is an equidigital number, since it uses as much as digits as its factorization.

780928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6115 (or 6103 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 780928 is about 883.7013070037. The cubic root of 780928 is about 92.0881323070.

The spelling of 780928 in words is "seven hundred eighty thousand, nine hundred twenty-eight".