9857209056 has 48 divisors (see below), whose sum is σ = 25880374800. Its totient is φ = 3285075968.

The previous prime is 9857209031. The next prime is 9857209057. The reversal of 9857209056 is 6509027589.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×9857209056² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9857209057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797290 + ... + 809558.

It is an arithmetic number, because the mean of its divisors is an integer number (539174475).

Almost surely, 2^9857209056 is an apocalyptic number.

9857209056 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

9857209056 is an abundant number, since it is smaller than the sum of its proper divisors (16023165744).

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

9857209056 is a wasteful number, since it uses less digits than its factorization.

9857209056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20651 (or 20643 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 51.

The square root of 9857209056 is about 99283.4782630020. The cubic root of 9857209056 is about 2144.1310322197.

The spelling of 9857209056 in words is "nine billion, eight hundred fifty-seven million, two hundred nine thousand, fifty-six".