9820899864 has 64 divisors (see below), whose sum is σ = 28885010400. Its totient is φ = 3081065472.

The previous prime is 9820899859. The next prime is 9820899871. The reversal of 9820899864 is 4689980289.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1333597 + ... + 1340940.

Almost surely, 2^9820899864 is an apocalyptic number.

It is an amenable number.

9820899864 is an abundant number, since it is smaller than the sum of its proper divisors (19064110536).

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

9820899864 is a wasteful number, since it uses less digits than its factorization.

9820899864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674569 (or 2674559 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 63.

The square root of 9820899864 is about 99100.4533995683. The cubic root of 9820899864 is about 2141.4951457914.

The spelling of 9820899864 in words is "nine billion, eight hundred twenty million, eight hundred ninety-nine thousand, eight hundred sixty-four".