921798984960 has 864 divisors, whose sum is σ = 3762712541952. Its totient is φ = 203949342720.

The previous prime is 921798984949. The next prime is 921798984989. The reversal of 921798984960 is 69489897129.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 677294680 + ... + 677296040.

It is an arithmetic number, because the mean of its divisors is an integer number (4354991368).

Almost surely, 2^921798984960 is an apocalyptic number.

921798984960 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921798984960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881356270976).

921798984960 is an abundant number, since it is smaller than the sum of its proper divisors (2840913556992).

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

921798984960 is a wasteful number, since it uses less digits than its factorization.

921798984960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 72.

The spelling of 921798984960 in words is "nine hundred twenty-one billion, seven hundred ninety-eight million, nine hundred eighty-four thousand, nine hundred sixty".