511206728 has 32 divisors (see below), whose sum is σ = 1017356760. Its totient is φ = 239984640.

The previous prime is 511206727. The next prime is 511206743. The reversal of 511206728 is 827602115.

It can be written as a sum of positive squares in 4 ways, for example, as 469242244 + 41964484 = 21662^2 + 6478^2 .

It is a super-2 number, since 2×511206728² = 522664637504931968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 511206694 and 511206703.

It is not an unprimeable number, because it can be changed into a prime (511206727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54548 + ... + 63228.

Almost surely, 2^511206728 is an apocalyptic number.

It is an amenable number.

511206728 is a deficient number, since it is larger than the sum of its proper divisors (506150032).

511206728 is a wasteful number, since it uses less digits than its factorization.

511206728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9137 (or 9133 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 511206728 is about 22609.8812026954. The cubic root of 511206728 is about 799.5866239371.

The spelling of 511206728 in words is "five hundred eleven million, two hundred six thousand, seven hundred twenty-eight".