660533920 has 48 divisors (see below), whose sum is σ = 1579344480. Its totient is φ = 261025024.

The previous prime is 660533891. The next prime is 660533933. The reversal of 660533920 is 29335066.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11590 + ... + 38149.

It is an arithmetic number, because the mean of its divisors is an integer number (32903010).

Almost surely, 2^660533920 is an apocalyptic number.

It is an amenable number.

660533920 is an abundant number, since it is smaller than the sum of its proper divisors (918810560).

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

660533920 is a wasteful number, since it uses less digits than its factorization.

660533920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49837 (or 49829 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 34.

The square root of 660533920 is about 25700.8544605038. The cubic root of 660533920 is about 870.8934846897.

Adding to 660533920 its reverse (29335066), we get a palindrome (689868986).

The spelling of 660533920 in words is "six hundred sixty million, five hundred thirty-three thousand, nine hundred twenty".