9719728 has 20 divisors (see below), whose sum is σ = 18881728. Its totient is φ = 4847040.

The previous prime is 9719707. The next prime is 9719729. The reversal of 9719728 is 8279179.

It is a happy number.

It is a super-2 number, since 2×9719728² = 188946224787968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9719729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9313 + ... + 10303.

Almost surely, 2^9719728 is an apocalyptic number.

It is an amenable number.

9719728 is a deficient number, since it is larger than the sum of its proper divisors (9162000).

9719728 is a wasteful number, since it uses less digits than its factorization.

9719728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612 (or 1606 counting only the distinct ones).

The product of its digits is 63504, while the sum is 43.

The square root of 9719728 is about 3117.6478312985. The cubic root of 9719728 is about 213.4116075616.

The spelling of 9719728 in words is "nine million, seven hundred nineteen thousand, seven hundred twenty-eight".