7844220018 has 12 divisors (see below), whose sum is σ = 16995810078. Its totient is φ = 2614740000.

The previous prime is 7844220017. The next prime is 7844220023. The reversal of 7844220018 is 8100224487.

7844220018 is a `hidden beast` number, since 7 + 8 + 442 + 200 + 1 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7599829329 + 244390689 = 87177^2 + 15633^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7844220017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217894983 + ... + 217895018.

Almost surely, 2^7844220018 is an apocalyptic number.

7844220018 is an abundant number, since it is smaller than the sum of its proper divisors (9151590060).

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

7844220018 is a wasteful number, since it uses less digits than its factorization.

7844220018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435790009 (or 435790006 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 7844220018 is about 88567.6014014154. The cubic root of 7844220018 is about 1986.9331494642.

The spelling of 7844220018 in words is "seven billion, eight hundred forty-four million, two hundred twenty thousand, eighteen".