664324280 has 32 divisors (see below), whose sum is σ = 1515788640. Its totient is φ = 261985920.

The previous prime is 664324279. The next prime is 664324289. The reversal of 664324280 is 82423466.

It is a self number, because there is not a number n which added to its sum of digits gives 664324280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664324289) 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, 114119 + ... + 119798.

It is an arithmetic number, because the mean of its divisors is an integer number (47368395).

Almost surely, 2^664324280 is an apocalyptic number.

It is an amenable number.

664324280 is an abundant number, since it is smaller than the sum of its proper divisors (851464360).

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

664324280 is a wasteful number, since it uses less digits than its factorization.

664324280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233999 (or 233995 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 664324280 is about 25774.4889377074. The cubic root of 664324280 is about 872.5561324904.

The spelling of 664324280 in words is "six hundred sixty-four million, three hundred twenty-four thousand, two hundred eighty".