505431660 has 48 divisors (see below), whose sum is σ = 1417248000. Its totient is φ = 134587584.

The previous prime is 505431653. The next prime is 505431683. The reversal of 505431660 is 66134505.

It is a super-2 number, since 2×505431660² = 510922325860711200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38641 + ... + 50039.

It is an arithmetic number, because the mean of its divisors is an integer number (29526000).

Almost surely, 2^505431660 is an apocalyptic number.

It is an amenable number.

505431660 is an abundant number, since it is smaller than the sum of its proper divisors (911816340).

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

505431660 is a wasteful number, since it uses less digits than its factorization.

505431660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12150 (or 12148 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 505431660 is about 22481.8073116909. The cubic root of 505431660 is about 796.5642552794.

The spelling of 505431660 in words is "five hundred five million, four hundred thirty-one thousand, six hundred sixty".