501428840 has 96 divisors (see below), whose sum is σ = 1248518880. Its totient is φ = 181104000.

The previous prime is 501428833. The next prime is 501428843. The reversal of 501428840 is 48824105.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 501428797 and 501428806.

It is not an unprimeable number, because it can be changed into a prime (501428843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1020995 + ... + 1021485.

It is an arithmetic number, because the mean of its divisors is an integer number (13005405).

Almost surely, 2^501428840 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 501428840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (624259440).

501428840 is an abundant number, since it is smaller than the sum of its proper divisors (747090040).

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

501428840 is a wasteful number, since it uses less digits than its factorization.

501428840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 501428840 is about 22392.6068156434. The cubic root of 501428840 is about 794.4558543178.

The spelling of 501428840 in words is "five hundred one million, four hundred twenty-eight thousand, eight hundred forty".