6444628378 has 32 divisors (see below), whose sum is σ = 10267729920. Its totient is φ = 3028752000.

The previous prime is 6444628369. The next prime is 6444628403. The reversal of 6444628378 is 8738264446.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576583 + ... + 587653.

It is an arithmetic number, because the mean of its divisors is an integer number (320866560).

Almost surely, 2^6444628378 is an apocalyptic number.

6444628378 is a deficient number, since it is larger than the sum of its proper divisors (3823101542).

6444628378 is a wasteful number, since it uses less digits than its factorization.

6444628378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374.

The product of its digits is 6193152, while the sum is 52.

The square root of 6444628378 is about 80278.4427975531. The cubic root of 6444628378 is about 1860.9410948459.

The spelling of 6444628378 in words is "six billion, four hundred forty-four million, six hundred twenty-eight thousand, three hundred seventy-eight".