509999980 has 48 divisors (see below), whose sum is σ = 1242291456. Its totient is φ = 172244160.

The previous prime is 509999939. The next prime is 509999989. The reversal of 509999980 is 89999905.

It is not an unprimeable number, because it can be changed into a prime (509999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17806 + ... + 36565.

It is an arithmetic number, because the mean of its divisors is an integer number (25881072).

Almost surely, 2^509999980 is an apocalyptic number.

It is an amenable number.

509999980 is an abundant number, since it is smaller than the sum of its proper divisors (732291476).

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

509999980 is a wasteful number, since it uses less digits than its factorization.

509999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54454 (or 54452 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 58.

The square root of 509999980 is about 22583.1791384650. The cubic root of 509999980 is about 798.9569636015.

The spelling of 509999980 in words is "five hundred nine million, nine hundred ninety-nine thousand, nine hundred eighty".