6464516840 has 16 divisors (see below), whose sum is σ = 14545162980. Its totient is φ = 2585806720.

The previous prime is 6464516771. The next prime is 6464516881. The reversal of 6464516840 is 486154646.

It can be written as a sum of positive squares in 2 ways, for example, as 6368359204 + 96157636 = 79802^2 + 9806^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6464516791 and 6464516800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80806421 + ... + 80806500.

Almost surely, 2^6464516840 is an apocalyptic number.

It is an amenable number.

6464516840 is an abundant number, since it is smaller than the sum of its proper divisors (8080646140).

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

6464516840 is a wasteful number, since it uses less digits than its factorization.

6464516840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161612932 (or 161612928 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 6464516840 is about 80402.2191236038. The cubic root of 6464516840 is about 1862.8534496695.

The spelling of 6464516840 in words is "six billion, four hundred sixty-four million, five hundred sixteen thousand, eight hundred forty".