9698921820 has 288 divisors, whose sum is σ = 35498736000. Its totient is φ = 2140056576.

The previous prime is 9698921807. The next prime is 9698921831. The reversal of 9698921820 is 281298969.

It is a super-2 number, since 2×9698921820² (a number of 21 digits) contains 22 as substring.

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, 1787752 + ... + 1793168.

It is an arithmetic number, because the mean of its divisors is an integer number (123259500).

Almost surely, 2^9698921820 is an apocalyptic number.

9698921820 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 9698921820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17749368000).

9698921820 is an abundant number, since it is smaller than the sum of its proper divisors (25799814180).

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

9698921820 is a wasteful number, since it uses less digits than its factorization.

9698921820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5482 (or 5463 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 9698921820 is about 98483.1042362090. The cubic root of 9698921820 is about 2132.5922152766.

The spelling of 9698921820 in words is "nine billion, six hundred ninety-eight million, nine hundred twenty-one thousand, eight hundred twenty".