659645140 has 96 divisors (see below), whose sum is σ = 1744581888. Its totient is φ = 203520000.

The previous prime is 659645123. The next prime is 659645149. The reversal of 659645140 is 41546956.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 659645093 and 659645102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659645149) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153420 + ... + 157660.

It is an arithmetic number, because the mean of its divisors is an integer number (18172728).

Almost surely, 2^659645140 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 659645140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (872290944).

659645140 is an abundant number, since it is smaller than the sum of its proper divisors (1084936748).

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

659645140 is a wasteful number, since it uses less digits than its factorization.

659645140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4369 (or 4367 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 659645140 is about 25683.5577753550. The cubic root of 659645140 is about 870.5026997435.

The spelling of 659645140 in words is "six hundred fifty-nine million, six hundred forty-five thousand, one hundred forty".