659964720 has 80 divisors (see below), whose sum is σ = 2067055200. Its totient is φ = 174170112.

The previous prime is 659964719. The next prime is 659964727. The reversal of 659964720 is 27469956.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 659964720.

It is not an unprimeable number, because it can be changed into a prime (659964727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9106 + ... + 37454.

It is an arithmetic number, because the mean of its divisors is an integer number (25838190).

Almost surely, 2^659964720 is an apocalyptic number.

659964720 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 659964720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1033527600).

659964720 is an abundant number, since it is smaller than the sum of its proper divisors (1407090480).

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

659964720 is a wasteful number, since it uses less digits than its factorization.

659964720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28462 (or 28456 counting only the distinct ones).

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

The square root of 659964720 is about 25689.7785120853. The cubic root of 659964720 is about 870.6432552847.

The spelling of 659964720 in words is "six hundred fifty-nine million, nine hundred sixty-four thousand, seven hundred twenty".