659317638 has 96 divisors (see below), whose sum is σ = 1592680320. Its totient is φ = 181292160.

The previous prime is 659317621. The next prime is 659317649. The reversal of 659317638 is 836713956.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1000153 + ... + 1000811.

It is an arithmetic number, because the mean of its divisors is an integer number (16590420).

Almost surely, 2^659317638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 659317638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796340160).

659317638 is an abundant number, since it is smaller than the sum of its proper divisors (933362682).

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

659317638 is a wasteful number, since it uses less digits than its factorization.

659317638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 795 counting only the distinct ones).

The product of its digits is 816480, while the sum is 48.

The square root of 659317638 is about 25677.1812705367. The cubic root of 659317638 is about 870.3586128945.

The spelling of 659317638 in words is "six hundred fifty-nine million, three hundred seventeen thousand, six hundred thirty-eight".