664238480 has 40 divisors (see below), whose sum is σ = 1625640000. Its totient is φ = 251710848.

The previous prime is 664238473. The next prime is 664238483. The reversal of 664238480 is 84832466.

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

It is not an unprimeable number, because it can be changed into a prime (664238483) 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, 216980 + ... + 220019.

It is an arithmetic number, because the mean of its divisors is an integer number (40641000).

Almost surely, 2^664238480 is an apocalyptic number.

It is an amenable number.

664238480 is an abundant number, since it is smaller than the sum of its proper divisors (961401520).

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

664238480 is a wasteful number, since it uses less digits than its factorization.

664238480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437031 (or 437025 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 41.

The square root of 664238480 is about 25772.8244474679. The cubic root of 664238480 is about 872.5185662286.

The spelling of 664238480 in words is "six hundred sixty-four million, two hundred thirty-eight thousand, four hundred eighty".