9420728 has 16 divisors (see below), whose sum is σ = 17750760. Its totient is φ = 4687200.

The previous prime is 9420721. The next prime is 9420743. The reversal of 9420728 is 8270249.

It is a junction number, because it is equal to n+sod(n) for n = 9420694 and 9420703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9420721) 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, 1103 + ... + 4478.

Almost surely, 2^9420728 is an apocalyptic number.

It is an amenable number.

9420728 is a deficient number, since it is larger than the sum of its proper divisors (8330032).

9420728 is a wasteful number, since it uses less digits than its factorization.

9420728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5798 (or 5794 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 9420728 is about 3069.3204459619. The cubic root of 9420728 is about 211.2004414400.

The spelling of 9420728 in words is "nine million, four hundred twenty thousand, seven hundred twenty-eight".