6445438722 has 54 divisors (see below), whose sum is σ = 14171048073. Its totient is φ = 2117256624.

The previous prime is 6445438721. The next prime is 6445438729. The reversal of 6445438722 is 2278345446.

It is a happy number.

6445438722 is a `hidden beast` number, since 6 + 4 + 4 + 543 + 87 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5295618441 + 1149820281 = 72771^2 + 33909^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=56769.

Its product of digits (1290240) is a multiple of the sum of its prime factors (560).

It is not an unprimeable number, because it can be changed into a prime (6445438721) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 43257904 + ... + 43258052.

Almost surely, 2^6445438722 is an apocalyptic number.

6445438722 is an abundant number, since it is smaller than the sum of its proper divisors (7725609351).

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

6445438722 is a wasteful number, since it uses less digits than its factorization.

6445438722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 281 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 45.

The square root of 6445438722 is about 80283.4897223582. The cubic root of 6445438722 is about 1861.0190894776.

The spelling of 6445438722 in words is "six billion, four hundred forty-five million, four hundred thirty-eight thousand, seven hundred twenty-two".