664289108 has 24 divisors (see below), whose sum is σ = 1329125952. Its totient is φ = 284577984.

The previous prime is 664289107. The next prime is 664289141. The reversal of 664289108 is 801982466.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664289107) 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, 122135 + ... + 127457.

It is an arithmetic number, because the mean of its divisors is an integer number (55380248).

Almost surely, 2^664289108 is an apocalyptic number.

It is an amenable number.

664289108 is an abundant number, since it is smaller than the sum of its proper divisors (664836844).

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

664289108 is a wasteful number, since it uses less digits than its factorization.

664289108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9791 (or 9789 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 664289108 is about 25773.8066261078. The cubic root of 664289108 is about 872.5407333413.

The spelling of 664289108 in words is "six hundred sixty-four million, two hundred eighty-nine thousand, one hundred eight".