6464007440 has 40 divisors (see below), whose sum is σ = 16395075648. Its totient is φ = 2350547840.

The previous prime is 6464007437. The next prime is 6464007443. The reversal of 6464007440 is 447004646.

It is an interprime number because it is at equal distance from previous prime (6464007437) and next prime (6464007443).

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 6464007440.

It is not an unprimeable number, because it can be changed into a prime (6464007443) 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, 3671852 + ... + 3673611.

Almost surely, 2^6464007440 is an apocalyptic number.

It is an amenable number.

6464007440 is an abundant number, since it is smaller than the sum of its proper divisors (9931068208).

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

6464007440 is a wasteful number, since it uses less digits than its factorization.

6464007440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7345487 (or 7345481 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 6464007440 is about 80399.0512381832. The cubic root of 6464007440 is about 1862.8045178108.

The spelling of 6464007440 in words is "six billion, four hundred sixty-four million, seven thousand, four hundred forty".