9781600728 has 32 divisors (see below), whose sum is σ = 24465355200. Its totient is φ = 3259019808.

The previous prime is 9781600711. The next prime is 9781600757. The reversal of 9781600728 is 8270061879.

It is a congruent number.

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, 41226 + ... + 145817.

It is an arithmetic number, because the mean of its divisors is an integer number (764542350).

Almost surely, 2^9781600728 is an apocalyptic number.

It is an amenable number.

9781600728 is an abundant number, since it is smaller than the sum of its proper divisors (14683754472).

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

9781600728 is a wasteful number, since it uses less digits than its factorization.

9781600728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189231 (or 189227 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 9781600728 is about 98901.9753493326. The cubic root of 9781600728 is about 2138.6348710498.

The spelling of 9781600728 in words is "nine billion, seven hundred eighty-one million, six hundred thousand, seven hundred twenty-eight".