660321340 has 96 divisors (see below), whose sum is σ = 1623896064. Its totient is φ = 220872960.

The previous prime is 660321253. The next prime is 660321341. The reversal of 660321340 is 43123066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660321341) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1425949 + ... + 1426411.

It is an arithmetic number, because the mean of its divisors is an integer number (16915584).

Almost surely, 2^660321340 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 660321340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811948032).

660321340 is an abundant number, since it is smaller than the sum of its proper divisors (963574724).

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

660321340 is a wasteful number, since it uses less digits than its factorization.

660321340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 660321340 is about 25696.7184675398. The cubic root of 660321340 is about 870.8000479533.

The spelling of 660321340 in words is "six hundred sixty million, three hundred twenty-one thousand, three hundred forty".