7813961380 has 12 divisors (see below), whose sum is σ = 16409318940. Its totient is φ = 3125584544.

The previous prime is 7813961369. The next prime is 7813961399. The reversal of 7813961380 is 831693187.

It can be written as a sum of positive squares in 2 ways, for example, as 2243727424 + 5570233956 = 47368^2 + 74634^2 .

It is a super-2 number, since 2×7813961380² (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 7813961380.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195349015 + ... + 195349054.

It is an arithmetic number, because the mean of its divisors is an integer number (1367443245).

Almost surely, 2^7813961380 is an apocalyptic number.

It is an amenable number.

7813961380 is an abundant number, since it is smaller than the sum of its proper divisors (8595357560).

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

7813961380 is a wasteful number, since it uses less digits than its factorization.

7813961380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390698078 (or 390698076 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 7813961380 is about 88396.6140754271. The cubic root of 7813961380 is about 1984.3750297080.

The spelling of 7813961380 in words is "seven billion, eight hundred thirteen million, nine hundred sixty-one thousand, three hundred eighty".