659940736 has 128 divisors (see below), whose sum is σ = 1650196800. Its totient is φ = 255909888.

The previous prime is 659940709. The next prime is 659940739. The reversal of 659940736 is 637049956.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 659940736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659940739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616810 + ... + 617878.

Almost surely, 2^659940736 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 659940736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825098400).

659940736 is an abundant number, since it is smaller than the sum of its proper divisors (990256064).

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

659940736 is a wasteful number, since it uses less digits than its factorization.

659940736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 49.

The square root of 659940736 is about 25689.3117074008. The cubic root of 659940736 is about 870.6327083771.

The spelling of 659940736 in words is "six hundred fifty-nine million, nine hundred forty thousand, seven hundred thirty-six".