6464726540 has 24 divisors (see below), whose sum is σ = 13577663232. Its totient is φ = 2585559680.

The previous prime is 6464726539. The next prime is 6464726549. The reversal of 6464726540 is 456274646.

It is a junction number, because it is equal to n+sod(n) for n = 6464726491 and 6464726500.

It is not an unprimeable number, because it can be changed into a prime (6464726549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193685 + ... + 224595.

It is an arithmetic number, because the mean of its divisors is an integer number (565735968).

Almost surely, 2^6464726540 is an apocalyptic number.

It is an amenable number.

6464726540 is an abundant number, since it is smaller than the sum of its proper divisors (7112936692).

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

6464726540 is a wasteful number, since it uses less digits than its factorization.

6464726540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41377 (or 41375 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 44.

The square root of 6464726540 is about 80403.5231815124. The cubic root of 6464726540 is about 1862.8735922496.

The spelling of 6464726540 in words is "six billion, four hundred sixty-four million, seven hundred twenty-six thousand, five hundred forty".