664243230 has 128 divisors (see below), whose sum is σ = 1927941120. Its totient is φ = 143078400.

The previous prime is 664243171. The next prime is 664243259. The reversal of 664243230 is 32342466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1104930 + ... + 1105530.

It is an arithmetic number, because the mean of its divisors is an integer number (15062040).

Almost surely, 2^664243230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664243230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963970560).

664243230 is an abundant number, since it is smaller than the sum of its proper divisors (1263697890).

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

664243230 is a wasteful number, since it uses less digits than its factorization.

664243230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 664243230 is about 25772.9165986312. The cubic root of 664243230 is about 872.5206460305.

Adding to 664243230 its reverse (32342466), we get a palindrome (696585696).

The spelling of 664243230 in words is "six hundred sixty-four million, two hundred forty-three thousand, two hundred thirty".