9856420640 has 48 divisors (see below), whose sum is σ = 25402688640. Its totient is φ = 3584152320.

The previous prime is 9856420631. The next prime is 9856420649. The reversal of 9856420640 is 460246589.

It is an interprime number because it is at equal distance from previous prime (9856420631) and next prime (9856420649).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 9856420591 and 9856420600.

It is not an unprimeable number, because it can be changed into a prime (9856420649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2798360 + ... + 2801879.

It is an arithmetic number, because the mean of its divisors is an integer number (529222680).

Almost surely, 2^9856420640 is an apocalyptic number.

It is an amenable number.

9856420640 is an abundant number, since it is smaller than the sum of its proper divisors (15546268000).

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

9856420640 is a wasteful number, since it uses less digits than its factorization.

9856420640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5600265 (or 5600257 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 9856420640 is about 99279.5076538960. The cubic root of 9856420640 is about 2144.0738655215.

The spelling of 9856420640 in words is "nine billion, eight hundred fifty-six million, four hundred twenty thousand, six hundred forty".