9857888820 has 72 divisors (see below), whose sum is σ = 32202444456. Its totient is φ = 2426556672.

The previous prime is 9857888819. The next prime is 9857888827. The reversal of 9857888820 is 288887589.

It can be written as a sum of positive squares in 4 ways, for example, as 364504464 + 9493384356 = 19092^2 + 97434^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9857888827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2104047 + ... + 2108726.

It is an arithmetic number, because the mean of its divisors is an integer number (447256173).

Almost surely, 2^9857888820 is an apocalyptic number.

9857888820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9857888820 is an abundant number, since it is smaller than the sum of its proper divisors (22344555636).

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

9857888820 is a wasteful number, since it uses less digits than its factorization.

9857888820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4212801 (or 4212796 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 63.

The square root of 9857888820 is about 99286.9015530246. The cubic root of 9857888820 is about 2144.1803182997.

The spelling of 9857888820 in words is "nine billion, eight hundred fifty-seven million, eight hundred eighty-eight thousand, eight hundred twenty".