9621368728 has 32 divisors (see below), whose sum is σ = 18239981760. Its totient is φ = 4757562880.

The previous prime is 9621368719. The next prime is 9621368749. The reversal of 9621368728 is 8278631269.

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, 405201 + ... + 428287.

It is an arithmetic number, because the mean of its divisors is an integer number (569999430).

Almost surely, 2^9621368728 is an apocalyptic number.

It is an amenable number.

9621368728 is a deficient number, since it is larger than the sum of its proper divisors (8618613032).

9621368728 is a wasteful number, since it uses less digits than its factorization.

9621368728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23667 (or 23663 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 52.

The square root of 9621368728 is about 98088.5759301255. The cubic root of 9621368728 is about 2126.8928907491.

The spelling of 9621368728 in words is "nine billion, six hundred twenty-one million, three hundred sixty-eight thousand, seven hundred twenty-eight".