842021568 has 140 divisors (see below), whose sum is σ = 2539243080. Its totient is φ = 275816448.

The previous prime is 842021527. The next prime is 842021569. The reversal of 842021568 is 865120248.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (842021569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 304480 + ... + 307232.

Almost surely, 2^842021568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 842021568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1269621540).

842021568 is an abundant number, since it is smaller than the sum of its proper divisors (1697221512).

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

842021568 is a wasteful number, since it uses less digits than its factorization.

842021568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836 (or 2817 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 842021568 is about 29017.6078958966. The cubic root of 842021568 is about 944.2951054771.

The spelling of 842021568 in words is "eight hundred forty-two million, twenty-one thousand, five hundred sixty-eight".