664423736 has 8 divisors (see below), whose sum is σ = 1245794520. Its totient is φ = 332211864.

The previous prime is 664423729. The next prime is 664423759. The reversal of 664423736 is 637324466.

664423736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 664423693 and 664423702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41526476 + ... + 41526491.

It is an arithmetic number, because the mean of its divisors is an integer number (155724315).

Almost surely, 2^664423736 is an apocalyptic number.

It is an amenable number.

664423736 is a deficient number, since it is larger than the sum of its proper divisors (581370784).

664423736 is a wasteful number, since it uses less digits than its factorization.

664423736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83052973 (or 83052969 counting only the distinct ones).

The product of its digits is 435456, while the sum is 41.

The square root of 664423736 is about 25776.4182151051. The cubic root of 664423736 is about 872.5996737824.

The spelling of 664423736 in words is "six hundred sixty-four million, four hundred twenty-three thousand, seven hundred thirty-six".