7818840445 has 8 divisors (see below), whose sum is σ = 10104347736. Its totient is φ = 5773912896.

The previous prime is 7818840443. The next prime is 7818840487. The reversal of 7818840445 is 5440488187.

7818840445 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 485144676 + 7333695769 = 22026^2 + 85637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7818840445 - 2¹ = 7818840443 is a prime.

It is a super-2 number, since 2×7818840445² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7818840443) 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, 60144862 + ... + 60144991.

It is an arithmetic number, because the mean of its divisors is an integer number (1263043467).

Almost surely, 2^7818840445 is an apocalyptic number.

It is an amenable number.

7818840445 is a deficient number, since it is larger than the sum of its proper divisors (2285507291).

7818840445 is a wasteful number, since it uses less digits than its factorization.

7818840445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120289871.

The product of its (nonzero) digits is 1146880, while the sum is 49.

The square root of 7818840445 is about 88424.2073473096. The cubic root of 7818840445 is about 1984.7879606933.

The spelling of 7818840445 in words is "seven billion, eight hundred eighteen million, eight hundred forty thousand, four hundred forty-five".