659998680 has 192 divisors, whose sum is σ = 2247367680. Its totient is φ = 153619200.

The previous prime is 659998679. The next prime is 659998693. The reversal of 659998680 is 86899956.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5196777 + ... + 5196903.

It is an arithmetic number, because the mean of its divisors is an integer number (11705040).

Almost surely, 2^659998680 is an apocalyptic number.

659998680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 659998680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123683840).

659998680 is an abundant number, since it is smaller than the sum of its proper divisors (1587369000).

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

659998680 is a wasteful number, since it uses less digits than its factorization.

659998680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 60.

The square root of 659998680 is about 25690.4394668523. The cubic root of 659998680 is about 870.6581886778.

It can be divided in two parts, 6599986 and 80, that added together give a palindrome (6600066).

The spelling of 659998680 in words is "six hundred fifty-nine million, nine hundred ninety-eight thousand, six hundred eighty".