664020212 has 12 divisors (see below), whose sum is σ = 1212558816. Its totient is φ = 317574840.

The previous prime is 664020131. The next prime is 664020229. The reversal of 664020212 is 212020466.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3608714 + ... + 3608897.

It is an arithmetic number, because the mean of its divisors is an integer number (101046568).

Almost surely, 2^664020212 is an apocalyptic number.

It is an amenable number.

664020212 is a deficient number, since it is larger than the sum of its proper divisors (548538604).

664020212 is a wasteful number, since it uses less digits than its factorization.

664020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7217638 (or 7217636 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 664020212 is about 25768.5896393264. The cubic root of 664020212 is about 872.4229862265.

Adding to 664020212 its reverse (212020466), we get a palindrome (876040678).

The spelling of 664020212 in words is "six hundred sixty-four million, twenty thousand, two hundred twelve".