664999908 has 24 divisors (see below), whose sum is σ = 1562833440. Its totient is φ = 220071360.

The previous prime is 664999903. The next prime is 664999921. The reversal of 664999908 is 809999466.

It is not an unprimeable number, because it can be changed into a prime (664999903) 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, 197673 + ... + 201008.

It is an arithmetic number, because the mean of its divisors is an integer number (65118060).

Almost surely, 2^664999908 is an apocalyptic number.

It is an amenable number.

664999908 is an abundant number, since it is smaller than the sum of its proper divisors (897833532).

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

664999908 is a wasteful number, since it uses less digits than its factorization.

664999908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398827 (or 398825 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 60.

The square root of 664999908 is about 25787.5921326517. The cubic root of 664999908 is about 872.8518332668.

The spelling of 664999908 in words is "six hundred sixty-four million, nine hundred ninety-nine thousand, nine hundred eight".