842640804 has 72 divisors (see below), whose sum is σ = 2246156640. Its totient is φ = 265617792.

The previous prime is 842640803. The next prime is 842640829. The reversal of 842640804 is 408046248.

842640804 is a `hidden beast` number, since 8 + 4 + 2 + 640 + 8 + 0 + 4 = 666.

842640804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (842640803) 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, 749787 + ... + 750909.

It is an arithmetic number, because the mean of its divisors is an integer number (31196620).

Almost surely, 2^842640804 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 842640804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123078320).

842640804 is an abundant number, since it is smaller than the sum of its proper divisors (1403515836).

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

842640804 is a wasteful number, since it uses less digits than its factorization.

842640804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249 (or 2244 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 842640804 is about 29028.2759391597. The cubic root of 842640804 is about 944.5265319480.

The spelling of 842640804 in words is "eight hundred forty-two million, six hundred forty thousand, eight hundred four".