515016820 has 12 divisors (see below), whose sum is σ = 1081535364. Its totient is φ = 206006720.

The previous prime is 515016797. The next prime is 515016863. The reversal of 515016820 is 28610515.

It can be written as a sum of positive squares in 2 ways, for example, as 322417936 + 192598884 = 17956^2 + 13878^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12875401 + ... + 12875440.

It is an arithmetic number, because the mean of its divisors is an integer number (90127947).

Almost surely, 2^515016820 is an apocalyptic number.

It is an amenable number.

515016820 is an abundant number, since it is smaller than the sum of its proper divisors (566518544).

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

515016820 is a wasteful number, since it uses less digits than its factorization.

515016820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25750850 (or 25750848 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 515016820 is about 22693.9820216726. The cubic root of 515016820 is about 801.5681844052.

The spelling of 515016820 in words is "five hundred fifteen million, sixteen thousand, eight hundred twenty".