664063680 has 336 divisors, whose sum is σ = 2585191680. Its totient is φ = 143603712.

The previous prime is 664063669. The next prime is 664063693. The reversal of 664063680 is 86360466.

It is a tau number, because it is divible by the number of its divisors (336).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 893389 + ... + 894131.

Almost surely, 2^664063680 is an apocalyptic number.

664063680 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 664063680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1292595840).

664063680 is an abundant number, since it is smaller than the sum of its proper divisors (1921128000).

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

664063680 is a wasteful number, since it uses less digits than its factorization.

664063680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 664063680 is about 25769.4330554632. The cubic root of 664063680 is about 872.4420226224.

The spelling of 664063680 in words is "six hundred sixty-four million, sixty-three thousand, six hundred eighty".