660033920 has 192 divisors, whose sum is σ = 1977922800. Its totient is φ = 208760832.

The previous prime is 660033893. The next prime is 660033923. The reversal of 660033920 is 29330066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660033923) 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 23 ways as a sum of consecutive naturals, for example, 406871 + ... + 408489.

Almost surely, 2^660033920 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 660033920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (988961400).

660033920 is an abundant number, since it is smaller than the sum of its proper divisors (1317888880).

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

660033920 is a wasteful number, since it uses less digits than its factorization.

660033920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 660033920 is about 25691.1253159530. The cubic root of 660033920 is about 870.6736843899.

Adding to 660033920 its reverse (29330066), we get a palindrome (689363986).

The spelling of 660033920 in words is "six hundred sixty million, thirty-three thousand, nine hundred twenty".