501720 has 64 divisors (see below), whose sum is σ = 1559520. Its totient is φ = 129024.

The previous prime is 501719. The next prime is 501731. The reversal of 501720 is 27105.

It is a happy number.

501720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 501720.

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, 4384 + ... + 4496.

2⁵⁰¹⁷²⁰ 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 501720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (779760).

501720 is an abundant number, since it is smaller than the sum of its proper divisors (1057800).

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

501720 is a wasteful number, since it uses less digits than its factorization.

501720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 501720 is about 708.3219606930. The cubic root of 501720 is about 79.4609594318.

Adding to 501720 its reverse (27105), we get a palindrome (528825).

It can be divided in two parts, 501 and 720, that added together give a palindrome (1221).

The spelling of 501720 in words is "five hundred one thousand, seven hundred twenty".