9999728 has 10 divisors (see below), whose sum is σ = 19374504. Its totient is φ = 4999856.

The previous prime is 9999713. The next prime is 9999739. The reversal of 9999728 is 8279999.

It is a self number, because there is not a number n which added to its sum of digits gives 9999728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312476 + ... + 312507.

Almost surely, 2^9999728 is an apocalyptic number.

It is an amenable number.

9999728 is a deficient number, since it is larger than the sum of its proper divisors (9374776).

9999728 is a wasteful number, since it uses less digits than its factorization.

9999728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624991 (or 624985 counting only the distinct ones).

The product of its digits is 734832, while the sum is 53.

The square root of 9999728 is about 3162.2346528997. The cubic root of 9999728 is about 215.4415156314.

The spelling of 9999728 in words is "nine million, nine hundred ninety-nine thousand, seven hundred twenty-eight".