6445602440 has 16 divisors (see below), whose sum is σ = 14502605580. Its totient is φ = 2578240960.

The previous prime is 6445602413. The next prime is 6445602451. The reversal of 6445602440 is 442065446.

It can be written as a sum of positive squares in 2 ways, for example, as 6312938116 + 132664324 = 79454^2 + 11518^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6445602440.

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, 80569991 + ... + 80570070.

Almost surely, 2^6445602440 is an apocalyptic number.

It is an amenable number.

6445602440 is an abundant number, since it is smaller than the sum of its proper divisors (8057003140).

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

6445602440 is a wasteful number, since it uses less digits than its factorization.

6445602440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161140072 (or 161140068 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

The square root of 6445602440 is about 80284.5093402208. The cubic root of 6445602440 is about 1861.0348463436.

Adding to 6445602440 its reverse (442065446), we get a palindrome (6887667886).

The spelling of 6445602440 in words is "six billion, four hundred forty-five million, six hundred two thousand, four hundred forty".