506778709 has 4 divisors (see below), whose sum is σ = 507512800. Its totient is φ = 506044620.

The previous prime is 506778703. The next prime is 506778719. The reversal of 506778709 is 907877605.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 506778709 - 2¹¹ = 506776661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506778703) 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, 366009 + ... + 367390.

It is an arithmetic number, because the mean of its divisors is an integer number (126878200).

Almost surely, 2^506778709 is an apocalyptic number.

It is an amenable number.

506778709 is a deficient number, since it is larger than the sum of its proper divisors (734091).

506778709 is an equidigital number, since it uses as much as digits as its factorization.

506778709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734090.

The product of its (nonzero) digits is 740880, while the sum is 49.

The square root of 506778709 is about 22511.7460229099. The cubic root of 506778709 is about 797.2712808008.

The spelling of 506778709 in words is "five hundred six million, seven hundred seventy-eight thousand, seven hundred nine".