517106728 has 8 divisors (see below), whose sum is σ = 969575130. Its totient is φ = 258553360.

The previous prime is 517106701. The next prime is 517106729. The reversal of 517106728 is 827601715.

It can be written as a sum of positive squares in only one way, i.e., 374112964 + 142993764 = 19342^2 + 11958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (517106729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32319163 + ... + 32319178.

Almost surely, 2^517106728 is an apocalyptic number.

It is an amenable number.

517106728 is a deficient number, since it is larger than the sum of its proper divisors (452468402).

517106728 is a wasteful number, since it uses less digits than its factorization.

517106728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64638347 (or 64638343 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 517106728 is about 22739.9808267289. The cubic root of 517106728 is about 802.6509599776.

The spelling of 517106728 in words is "five hundred seventeen million, one hundred six thousand, seven hundred twenty-eight".