659399680 has 88 divisors (see below), whose sum is σ = 1636699320. Its totient is φ = 254607360.

The previous prime is 659399677. The next prime is 659399749. The reversal of 659399680 is 86993956.

It can be written as a sum of positive squares in 4 ways, for example, as 49112064 + 610287616 = 7008^2 + 24704^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146260 + ... + 150700.

Almost surely, 2^659399680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 659399680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818349660).

659399680 is an abundant number, since it is smaller than the sum of its proper divisors (977299640).

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

659399680 is a wasteful number, since it uses less digits than its factorization.

659399680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495 (or 4477 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 55.

The square root of 659399680 is about 25678.7787871620. The cubic root of 659399680 is about 870.3947123381.

The spelling of 659399680 in words is "six hundred fifty-nine million, three hundred ninety-nine thousand, six hundred eighty".