664385070 has 64 divisors (see below), whose sum is σ = 1666059840. Its totient is φ = 169344000.

The previous prime is 664385069. The next prime is 664385081. The reversal of 664385070 is 70583466.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84090 + ... + 91650.

It is an arithmetic number, because the mean of its divisors is an integer number (26032185).

Almost surely, 2^664385070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664385070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833029920).

664385070 is an abundant number, since it is smaller than the sum of its proper divisors (1001674770).

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

664385070 is a wasteful number, since it uses less digits than its factorization.

664385070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7701.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 664385070 is about 25775.6681775662. The cubic root of 664385070 is about 872.5827465357.

The spelling of 664385070 in words is "six hundred sixty-four million, three hundred eighty-five thousand, seventy".