513216728 has 16 divisors (see below), whose sum is σ = 962525760. Its totient is φ = 256543200.

The previous prime is 513216727. The next prime is 513216731. The reversal of 513216728 is 827612315.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513216727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48473 + ... + 58103.

It is an arithmetic number, because the mean of its divisors is an integer number (60157860).

Almost surely, 2^513216728 is an apocalyptic number.

It is an amenable number.

513216728 is a deficient number, since it is larger than the sum of its proper divisors (449309032).

513216728 is a wasteful number, since it uses less digits than its factorization.

513216728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16298 (or 16294 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 513216728 is about 22654.2871880799. The cubic root of 513216728 is about 800.6332111723.

The spelling of 513216728 in words is "five hundred thirteen million, two hundred sixteen thousand, seven hundred twenty-eight".