660433920 has 352 divisors, whose sum is σ = 2326702080. Its totient is φ = 159252480.

The previous prime is 660433919. The next prime is 660433927. The reversal of 660433920 is 29334066.

It is not an unprimeable number, because it can be changed into a prime (660433927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9047004 + ... + 9047076.

Almost surely, 2^660433920 is an apocalyptic number.

660433920 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 660433920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1163351040).

660433920 is an abundant number, since it is smaller than the sum of its proper divisors (1666268160).

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

660433920 is a wasteful number, since it uses less digits than its factorization.

660433920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 660433920 is about 25698.9089262560. The cubic root of 660433920 is about 870.8495335056.

Adding to 660433920 its reverse (29334066), we get a palindrome (689767986).

The spelling of 660433920 in words is "six hundred sixty million, four hundred thirty-three thousand, nine hundred twenty".