6445187876 has 12 divisors (see below), whose sum is σ = 11382557340. Its totient is φ = 3193028640.

The previous prime is 6445187873. The next prime is 6445187927. The reversal of 6445187876 is 6787815446.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4219801600 + 2225386276 = 64960^2 + 47174^2 .

It is not an unprimeable number, because it can be changed into a prime (6445187873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7390835 + ... + 7391706.

It is an arithmetic number, because the mean of its divisors is an integer number (948546445).

Almost surely, 2^6445187876 is an apocalyptic number.

It is an amenable number.

6445187876 is a deficient number, since it is larger than the sum of its proper divisors (4937369464).

6445187876 is a wasteful number, since it uses less digits than its factorization.

6445187876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14782654 (or 14782652 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 56.

The square root of 6445187876 is about 80281.9274556858. The cubic root of 6445187876 is about 1860.9949465515.

The spelling of 6445187876 in words is "six billion, four hundred forty-five million, one hundred eighty-seven thousand, eight hundred seventy-six".