501660 has 48 divisors (see below), whose sum is σ = 1562400. Its totient is φ = 133632.

The previous prime is 501659. The next prime is 501691. The reversal of 501660 is 66105.

501660 is a `hidden beast` number, since 5 + 0 + 1 + 660 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 76 + ... + 1004.

It is an arithmetic number, because the mean of its divisors is an integer number (32550).

2⁵⁰¹⁶⁶⁰ 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 501660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (781200).

501660 is an abundant number, since it is smaller than the sum of its proper divisors (1060740).

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

501660 is a wasteful number, since it uses less digits than its factorization.

501660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 501660 is about 708.2796058055. The cubic root of 501660 is about 79.4577917635.

Adding to 501660 its reverse (66105), we get a palindrome (567765).

The spelling of 501660 in words is "five hundred one thousand, six hundred sixty".