664235696 has 40 divisors (see below), whose sum is σ = 1374782544. Its totient is φ = 309800960.

The previous prime is 664235657. The next prime is 664235707. The reversal of 664235696 is 696532466.

It is a self number, because there is not a number n which added to its sum of digits gives 664235696.

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 7 ways as a sum of consecutive naturals, for example, 19931 + ... + 41541.

Almost surely, 2^664235696 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 664235696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687391272).

664235696 is an abundant number, since it is smaller than the sum of its proper divisors (710546848).

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

664235696 is a wasteful number, since it uses less digits than its factorization.

664235696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21749 (or 21743 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 47.

The square root of 664235696 is about 25772.7704370330. The cubic root of 664235696 is about 872.5173472412.

The spelling of 664235696 in words is "six hundred sixty-four million, two hundred thirty-five thousand, six hundred ninety-six".