660332240 has 80 divisors (see below), whose sum is σ = 1596326400. Its totient is φ = 253754880.

The previous prime is 660332227. The next prime is 660332249. The reversal of 660332240 is 42233066.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660332249) 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, 368627 + ... + 370413.

It is an arithmetic number, because the mean of its divisors is an integer number (19954080).

Almost surely, 2^660332240 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 660332240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798163200).

660332240 is an abundant number, since it is smaller than the sum of its proper divisors (935994160).

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

660332240 is a wasteful number, since it uses less digits than its factorization.

660332240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980 (or 1974 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 660332240 is about 25696.9305560022. The cubic root of 660332240 is about 870.8048393924.

The spelling of 660332240 in words is "six hundred sixty million, three hundred thirty-two thousand, two hundred forty".