501665420 has 24 divisors (see below), whose sum is σ = 1099302624. Its totient is φ = 191941376.

The previous prime is 501665419. The next prime is 501665431. The reversal of 501665420 is 24566105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544829 + ... + 545748.

It is an arithmetic number, because the mean of its divisors is an integer number (45804276).

Almost surely, 2^501665420 is an apocalyptic number.

It is an amenable number.

501665420 is an abundant number, since it is smaller than the sum of its proper divisors (597637204).

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

501665420 is a wasteful number, since it uses less digits than its factorization.

501665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090609 (or 1090607 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 501665420 is about 22397.8887397897. Note that the first 3 decimals coincide. The cubic root of 501665420 is about 794.5807791988.

The spelling of 501665420 in words is "five hundred one million, six hundred sixty-five thousand, four hundred twenty".