9780428 has 24 divisors (see below), whose sum is σ = 20412672. Its totient is φ = 4009104.

The previous prime is 9780403. The next prime is 9780431. The reversal of 9780428 is 8240879.

9780428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9780391 and 9780400.

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, 6950 + ... + 8237.

It is an arithmetic number, because the mean of its divisors is an integer number (850528).

Almost surely, 2^9780428 is an apocalyptic number.

It is an amenable number.

9780428 is an abundant number, since it is smaller than the sum of its proper divisors (10632244).

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

9780428 is a wasteful number, since it uses less digits than its factorization.

9780428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15221 (or 15219 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 9780428 is about 3127.3675831280. The cubic root of 9780428 is about 213.8549399789.

The spelling of 9780428 in words is "nine million, seven hundred eighty thousand, four hundred twenty-eight".