664435388 has 6 divisors (see below), whose sum is σ = 1162761936. Its totient is φ = 332217692.

The previous prime is 664435379. The next prime is 664435399. The reversal of 664435388 is 883534466.

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, 83054420 + ... + 83054427.

It is an arithmetic number, because the mean of its divisors is an integer number (193793656).

Almost surely, 2^664435388 is an apocalyptic number.

It is an amenable number.

664435388 is a deficient number, since it is larger than the sum of its proper divisors (498326548).

664435388 is a wasteful number, since it uses less digits than its factorization.

664435388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166108851 (or 166108849 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 47.

The square root of 664435388 is about 25776.6442346555. The cubic root of 664435388 is about 872.6047746798.

The spelling of 664435388 in words is "six hundred sixty-four million, four hundred thirty-five thousand, three hundred eighty-eight".