660240420 has 96 divisors (see below), whose sum is σ = 2116171008. Its totient is φ = 150669312.

The previous prime is 660240389. The next prime is 660240433. The reversal of 660240420 is 24042066.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 460024 + ... + 461456.

It is an arithmetic number, because the mean of its divisors is an integer number (22043448).

Almost surely, 2^660240420 is an apocalyptic number.

660240420 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 660240420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058085504).

660240420 is an abundant number, since it is smaller than the sum of its proper divisors (1455930588).

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

660240420 is a wasteful number, since it uses less digits than its factorization.

660240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 660240420 is about 25695.1438991884. The cubic root of 660240420 is about 870.7644753645.

Adding to 660240420 its reverse (24042066), we get a palindrome (684282486).

The spelling of 660240420 in words is "six hundred sixty million, two hundred forty thousand, four hundred twenty".