509672785 has 4 divisors (see below), whose sum is σ = 611607348. Its totient is φ = 407738224.

The previous prime is 509672783. The next prime is 509672789. The reversal of 509672785 is 587276905.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 394260736 + 115412049 = 19856^2 + 10743^2 .

It is a cyclic number.

It is not a de Polignac number, because 509672785 - 2¹ = 509672783 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509672783) 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, 50967274 + ... + 50967283.

It is an arithmetic number, because the mean of its divisors is an integer number (152901837).

Almost surely, 2^509672785 is an apocalyptic number.

It is an amenable number.

509672785 is a deficient number, since it is larger than the sum of its proper divisors (101934563).

509672785 is a wasteful number, since it uses less digits than its factorization.

509672785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101934562.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 509672785 is about 22575.9337569900. The cubic root of 509672785 is about 798.7860677465.

The spelling of 509672785 in words is "five hundred nine million, six hundred seventy-two thousand, seven hundred eighty-five".