7818441444 has 36 divisors (see below), whose sum is σ = 21559945680. Its totient is φ = 2369224560.

The previous prime is 7818441391. The next prime is 7818441481. The reversal of 7818441444 is 4441448187.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×7818441444² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7818441444.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9871374 + ... + 9872165.

It is an arithmetic number, because the mean of its divisors is an integer number (598887380).

Almost surely, 2^7818441444 is an apocalyptic number.

It is an amenable number.

7818441444 is an abundant number, since it is smaller than the sum of its proper divisors (13741504236).

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

7818441444 is a wasteful number, since it uses less digits than its factorization.

7818441444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19743560 (or 19743555 counting only the distinct ones).

The product of its digits is 458752, while the sum is 45.

The square root of 7818441444 is about 88421.9511433671. The cubic root of 7818441444 is about 1984.7541984043.

The spelling of 7818441444 in words is "seven billion, eight hundred eighteen million, four hundred forty-one thousand, four hundred forty-four".