664013040 has 80 divisors (see below), whose sum is σ = 2108677536. Its totient is φ = 172748800.

The previous prime is 664013033. The next prime is 664013041. The reversal of 664013040 is 40310466.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 664013040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664013041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23901 + ... + 43580.

Almost surely, 2^664013040 is an apocalyptic number.

664013040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664013040 is an abundant number, since it is smaller than the sum of its proper divisors (1444664496).

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

664013040 is a wasteful number, since it uses less digits than its factorization.

664013040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67538 (or 67532 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 664013040 is about 25768.4504772794. The cubic root of 664013040 is about 872.4198452377.

The spelling of 664013040 in words is "six hundred sixty-four million, thirteen thousand, forty".