6460021644 has 12 divisors (see below), whose sum is σ = 15073383864. Its totient is φ = 2153340544.

The previous prime is 6460021613. The next prime is 6460021649. The reversal of 6460021644 is 4461200646.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (6460021649) 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, 269167557 + ... + 269167580.

It is an arithmetic number, because the mean of its divisors is an integer number (1256115322).

Almost surely, 2^6460021644 is an apocalyptic number.

It is an amenable number.

6460021644 is an abundant number, since it is smaller than the sum of its proper divisors (8613362220).

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

6460021644 is a wasteful number, since it uses less digits than its factorization.

6460021644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538335144 (or 538335142 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 6460021644 is about 80374.2598348501. The cubic root of 6460021644 is about 1862.4215621157.

The spelling of 6460021644 in words is "six billion, four hundred sixty million, twenty-one thousand, six hundred forty-four".