6445736972 has 12 divisors (see below), whose sum is σ = 11310778080. Its totient is φ = 3214086096.

The previous prime is 6445736963. The next prime is 6445737019. The reversal of 6445736972 is 2796375446.

It is a super-2 number, since 2×6445736972² = 83095050224415457568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2193947 + ... + 2196882.

It is an arithmetic number, because the mean of its divisors is an integer number (942564840).

Almost surely, 2^6445736972 is an apocalyptic number.

It is an amenable number.

6445736972 is a deficient number, since it is larger than the sum of its proper divisors (4865041108).

6445736972 is a wasteful number, since it uses less digits than its factorization.

6445736972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391200 (or 4391198 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 53.

The square root of 6445736972 is about 80285.3471811638. The cubic root of 6445736972 is about 1861.0477940342.

The spelling of 6445736972 in words is "six billion, four hundred forty-five million, seven hundred thirty-six thousand, nine hundred seventy-two".