663734320 has 40 divisors (see below), whose sum is σ = 1544276160. Its totient is φ = 265305600.

The previous prime is 663734311. The next prime is 663734377. The reversal of 663734320 is 23437366.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×663734320³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186316 + ... + 189844.

It is an arithmetic number, because the mean of its divisors is an integer number (38606904).

Almost surely, 2^663734320 is an apocalyptic number.

It is an amenable number.

663734320 is an abundant number, since it is smaller than the sum of its proper divisors (880541840).

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

663734320 is a wasteful number, since it uses less digits than its factorization.

663734320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5893 (or 5887 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 34.

The square root of 663734320 is about 25763.0417458809. The cubic root of 663734320 is about 872.2977618473.

The spelling of 663734320 in words is "six hundred sixty-three million, seven hundred thirty-four thousand, three hundred twenty".