780428 has 12 divisors (see below), whose sum is σ = 1489992. Its totient is φ = 354720.

The previous prime is 780421. The next prime is 780433. The reversal of 780428 is 824087.

780428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 780428.

It is not an unprimeable number, because it can be changed into a prime (780421) by changing a digit.

780428 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 in 3 ways as a sum of consecutive naturals, for example, 8825 + ... + 8912.

It is an arithmetic number, because the mean of its divisors is an integer number (124166).

2⁷⁸⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

780428 is a deficient number, since it is larger than the sum of its proper divisors (709564).

780428 is a wasteful number, since it uses less digits than its factorization.

780428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17752 (or 17750 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 780428 is about 883.4183606876. The cubic root of 780428 is about 92.0684745424.

The spelling of 780428 in words is "seven hundred eighty thousand, four hundred twenty-eight".