9616821680 has 40 divisors (see below), whose sum is σ = 22642152000. Its totient is φ = 3798033408.

The previous prime is 9616821679. The next prime is 9616821727. The reversal of 9616821680 is 861286169.

It is a tau number, because it is divible by the number of its divisors (40).

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, 754505 + ... + 767144.

It is an arithmetic number, because the mean of its divisors is an integer number (566053800).

Almost surely, 2^9616821680 is an apocalyptic number.

It is an amenable number.

9616821680 is an abundant number, since it is smaller than the sum of its proper divisors (13025330320).

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

9616821680 is a wasteful number, since it uses less digits than its factorization.

9616821680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521741 (or 1521735 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 9616821680 is about 98065.3949158417. The cubic root of 9616821680 is about 2126.5577822265.

The spelling of 9616821680 in words is "nine billion, six hundred sixteen million, eight hundred twenty-one thousand, six hundred eighty".