664615212 has 24 divisors (see below), whose sum is σ = 1632388800. Its totient is φ = 209878416.

The previous prime is 664615139. The next prime is 664615219. The reversal of 664615212 is 212516466.

It is not an unprimeable number, because it can be changed into a prime (664615219) 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, 1457262 + ... + 1457717.

It is an arithmetic number, because the mean of its divisors is an integer number (68016200).

Almost surely, 2^664615212 is an apocalyptic number.

It is an amenable number.

664615212 is an abundant number, since it is smaller than the sum of its proper divisors (967773588).

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

664615212 is a wasteful number, since it uses less digits than its factorization.

664615212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2915005 (or 2915003 counting only the distinct ones).

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

The square root of 664615212 is about 25780.1321175823. The cubic root of 664615212 is about 872.6834886928.

The spelling of 664615212 in words is "six hundred sixty-four million, six hundred fifteen thousand, two hundred twelve".