664420412 has 12 divisors (see below), whose sum is σ = 1213289616. Its totient is φ = 317766240.

The previous prime is 664420409. The next prime is 664420423. The reversal of 664420412 is 214024466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3610889 + ... + 3611072.

It is an arithmetic number, because the mean of its divisors is an integer number (101107468).

Almost surely, 2^664420412 is an apocalyptic number.

It is an amenable number.

664420412 is a deficient number, since it is larger than the sum of its proper divisors (548869204).

664420412 is a wasteful number, since it uses less digits than its factorization.

664420412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7221988 (or 7221986 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 664420412 is about 25776.3537374858. The cubic root of 664420412 is about 872.5982186236.

Adding to 664420412 its reverse (214024466), we get a palindrome (878444878).

It can be divided in two parts, 66 and 4420412, that multiplied together give a palindrome (291747192).

The spelling of 664420412 in words is "six hundred sixty-four million, four hundred twenty thousand, four hundred twelve".