512728731 has 16 divisors (see below), whose sum is σ = 773932320. Its totient is φ = 335368800.

The previous prime is 512728717. The next prime is 512728751. The reversal of 512728731 is 137827215.

512728731 is a `hidden beast` number, since 512 + 72 + 8 + 73 + 1 = 666.

It is not a de Polignac number, because 512728731 - 2¹⁸ = 512466587 is a prime.

It is a super-2 number, since 2×512728731² = 525781503185740722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (512728751) 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, 177720 + ... + 180581.

It is an arithmetic number, because the mean of its divisors is an integer number (48370770).

Almost surely, 2^512728731 is an apocalyptic number.

512728731 is a deficient number, since it is larger than the sum of its proper divisors (261203589).

512728731 is a wasteful number, since it uses less digits than its factorization.

512728731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358363 (or 358357 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 512728731 is about 22643.5141044848. The cubic root of 512728731 is about 800.3793674678.

The spelling of 512728731 in words is "five hundred twelve million, seven hundred twenty-eight thousand, seven hundred thirty-one".