9780728 has 32 divisors (see below), whose sum is σ = 19042560. Its totient is φ = 4705920.

The previous prime is 9780721. The next prime is 9780731. The reversal of 9780728 is 8270879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9780721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51113 + ... + 51303.

It is an arithmetic number, because the mean of its divisors is an integer number (595080).

Almost surely, 2^9780728 is an apocalyptic number.

It is an amenable number.

9780728 is a deficient number, since it is larger than the sum of its proper divisors (9261832).

9780728 is a wasteful number, since it uses less digits than its factorization.

9780728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 9780728 is about 3127.4155464217. The cubic root of 9780728 is about 213.8571265167.

The spelling of 9780728 in words is "nine million, seven hundred eighty thousand, seven hundred twenty-eight".