664903500 has 192 divisors, whose sum is σ = 2035138560. Its totient is φ = 168480000.

The previous prime is 664903493. The next prime is 664903513. The reversal of 664903500 is 5309466.

It is a happy 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, 3673410 + ... + 3673590.

It is an arithmetic number, because the mean of its divisors is an integer number (10599680).

Almost surely, 2^664903500 is an apocalyptic number.

664903500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664903500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1017569280).

664903500 is an abundant number, since it is smaller than the sum of its proper divisors (1370235060).

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

664903500 is a wasteful number, since it uses less digits than its factorization.

664903500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 664903500 is about 25785.7227938253. The cubic root of 664903500 is about 872.8096508217.

The spelling of 664903500 in words is "six hundred sixty-four million, nine hundred three thousand, five hundred".