6444388472 has 8 divisors (see below), whose sum is σ = 12083228400. Its totient is φ = 3222194232.

The previous prime is 6444388399. The next prime is 6444388477. The reversal of 6444388472 is 2748834446.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 6444388472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444388477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402774272 + ... + 402774287.

It is an arithmetic number, because the mean of its divisors is an integer number (1510403550).

Almost surely, 2^6444388472 is an apocalyptic number.

It is an amenable number.

6444388472 is a deficient number, since it is larger than the sum of its proper divisors (5638839928).

6444388472 is a wasteful number, since it uses less digits than its factorization.

6444388472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805548565 (or 805548561 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 50.

The square root of 6444388472 is about 80276.9485718036. The cubic root of 6444388472 is about 1860.9180029287.

The spelling of 6444388472 in words is "six billion, four hundred forty-four million, three hundred eighty-eight thousand, four hundred seventy-two".