7813444656 has 20 divisors (see below), whose sum is σ = 20184732152. Its totient is φ = 2604481536.

The previous prime is 7813444637. The next prime is 7813444669. The reversal of 7813444656 is 6564443187.

It is a super-2 number, since 2×7813444656² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 162780097 = 7813444656 / (7 + 8 + 1 + 3 + 4 + 4 + 4 + 6 + 5 + 6).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 81390001 + ... + 81390096.

Almost surely, 2^7813444656 is an apocalyptic number.

It is an amenable number.

7813444656 is an abundant number, since it is smaller than the sum of its proper divisors (12371287496).

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

7813444656 is a wasteful number, since it uses less digits than its factorization.

7813444656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162780108 (or 162780102 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 48.

The square root of 7813444656 is about 88393.6912680990. The cubic root of 7813444656 is about 1984.3312876265.

The spelling of 7813444656 in words is "seven billion, eight hundred thirteen million, four hundred forty-four thousand, six hundred fifty-six".