664215612 has 24 divisors (see below), whose sum is σ = 1571069136. Its totient is φ = 218371968.

The previous prime is 664215611. The next prime is 664215631. The reversal of 664215612 is 216512466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664215611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378243 + ... + 379994.

It is an arithmetic number, because the mean of its divisors is an integer number (65461214).

Almost surely, 2^664215612 is an apocalyptic number.

It is an amenable number.

664215612 is an abundant number, since it is smaller than the sum of its proper divisors (906853524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664215612 is a wasteful number, since it uses less digits than its factorization.

664215612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758317 (or 758315 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 664215612 is about 25772.3807980559. The cubic root of 664215612 is about 872.5085532668.

The spelling of 664215612 in words is "six hundred sixty-four million, two hundred fifteen thousand, six hundred twelve".