7818891852 has 12 divisors (see below), whose sum is σ = 18244081016. Its totient is φ = 2606297280.

The previous prime is 7818891793. The next prime is 7818891859. The reversal of 7818891852 is 2581988187.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×7818891852² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7818891792 and 7818891801.

It is not an unprimeable number, because it can be changed into a prime (7818891859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325787149 + ... + 325787172.

Almost surely, 2^7818891852 is an apocalyptic number.

It is an amenable number.

7818891852 is an abundant number, since it is smaller than the sum of its proper divisors (10425189164).

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

7818891852 is a wasteful number, since it uses less digits than its factorization.

7818891852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651574328 (or 651574326 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 57.

The square root of 7818891852 is about 88424.4980308059. The cubic root of 7818891852 is about 1984.7923105187.

The spelling of 7818891852 in words is "seven billion, eight hundred eighteen million, eight hundred ninety-one thousand, eight hundred fifty-two".