660489830 has 64 divisors (see below), whose sum is σ = 1596284928. Its totient is φ = 190028160.

The previous prime is 660489769. The next prime is 660489833. The reversal of 660489830 is 38984066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660489833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22982 + ... + 43001.

It is an arithmetic number, because the mean of its divisors is an integer number (24941952).

Almost surely, 2^660489830 is an apocalyptic number.

660489830 is an abundant number, since it is smaller than the sum of its proper divisors (935795098).

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

660489830 is a wasteful number, since it uses less digits than its factorization.

660489830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66021.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 660489830 is about 25699.9966926068. The cubic root of 660489830 is about 870.8741071594.

The spelling of 660489830 in words is "six hundred sixty million, four hundred eighty-nine thousand, eight hundred thirty".