6445647898 has 8 divisors (see below), whose sum is σ = 9726367392. Its totient is φ = 3203525436.

The previous prime is 6445647893. The next prime is 6445647917. The reversal of 6445647898 is 8987465446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6445647893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9648840 + ... + 9649507.

It is an arithmetic number, because the mean of its divisors is an integer number (1215795924).

Almost surely, 2^6445647898 is an apocalyptic number.

6445647898 is a deficient number, since it is larger than the sum of its proper divisors (3280719494).

6445647898 is a wasteful number, since it uses less digits than its factorization.

6445647898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19298516.

The product of its digits is 46448640, while the sum is 61.

The square root of 6445647898 is about 80284.7924453940. The cubic root of 6445647898 is about 1861.0392213535.

The spelling of 6445647898 in words is "six billion, four hundred forty-five million, six hundred forty-seven thousand, eight hundred ninety-eight".