664640414 has 8 divisors (see below), whose sum is σ = 997194888. Its totient is φ = 332242120.

The previous prime is 664640401. The next prime is 664640419. The reversal of 664640414 is 414046466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664640419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27752 + ... + 45819.

It is an arithmetic number, because the mean of its divisors is an integer number (124649361).

Almost surely, 2^664640414 is an apocalyptic number.

664640414 is a deficient number, since it is larger than the sum of its proper divisors (332554474).

664640414 is a wasteful number, since it uses less digits than its factorization.

664640414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78090.

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 664640414 is about 25780.6209002033. The cubic root of 664640414 is about 872.6945191813.

The spelling of 664640414 in words is "six hundred sixty-four million, six hundred forty thousand, four hundred fourteen".