664025236 has 72 divisors (see below), whose sum is σ = 1446621120. Its totient is φ = 260347392.

The previous prime is 664025227. The next prime is 664025251. The reversal of 664025236 is 632520466.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 651135 + ... + 652153.

It is an arithmetic number, because the mean of its divisors is an integer number (20091960).

Almost surely, 2^664025236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664025236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (723310560).

664025236 is an abundant number, since it is smaller than the sum of its proper divisors (782595884).

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

664025236 is a wasteful number, since it uses less digits than its factorization.

664025236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121 (or 1082 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 664025236 is about 25768.6871221644. The cubic root of 664025236 is about 872.4251864818.

The spelling of 664025236 in words is "six hundred sixty-four million, twenty-five thousand, two hundred thirty-six".