7818815196 has 24 divisors (see below), whose sum is σ = 20271002640. Its totient is φ = 2606271696.

The previous prime is 7818815189. The next prime is 7818815197. The reversal of 7818815196 is 6915188187.

It is a happy number.

It is a super-2 number, since 2×7818815196² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7818815197) 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, 36198111 + ... + 36198326.

It is an arithmetic number, because the mean of its divisors is an integer number (844625110).

Almost surely, 2^7818815196 is an apocalyptic number.

It is an amenable number.

7818815196 is an abundant number, since it is smaller than the sum of its proper divisors (12452187444).

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

7818815196 is a wasteful number, since it uses less digits than its factorization.

7818815196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72396450 (or 72396442 counting only the distinct ones).

The product of its digits is 967680, while the sum is 54.

The square root of 7818815196 is about 88424.0645752049. The cubic root of 7818815196 is about 1984.7858242314.

The spelling of 7818815196 in words is "seven billion, eight hundred eighteen million, eight hundred fifteen thousand, one hundred ninety-six".