501220000 has 120 divisors (see below), whose sum is σ = 1298959200. Its totient is φ = 189792000.

The previous prime is 501219989. The next prime is 501220001. The reversal of 501220000 is 22105.

501220000 is nontrivially palindromic in base 9.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (501220001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 379341 + ... + 380659.

It is an arithmetic number, because the mean of its divisors is an integer number (10824660).

Almost surely, 2^501220000 is an apocalyptic number.

501220000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 501220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (649479600).

501220000 is an abundant number, since it is smaller than the sum of its proper divisors (797739200).

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

501220000 is a wasteful number, since it uses less digits than its factorization.

501220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1345 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 501220000 is about 22387.9431837764. The cubic root of 501220000 is about 794.3455447474.

Adding to 501220000 its reverse (22105), we get a palindrome (501242105).

The spelling of 501220000 in words is "five hundred one million, two hundred twenty thousand".