505780805 has 8 divisors (see below), whose sum is σ = 608341272. Its totient is φ = 403688448.

The previous prime is 505780777. The next prime is 505780811. The reversal of 505780805 is 508087505.

It can be written as a sum of positive squares in 4 ways, for example, as 3751969 + 502028836 = 1937^2 + 22406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505780805 - 2¹⁸ = 505518661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114644 + ... + 118973.

It is an arithmetic number, because the mean of its divisors is an integer number (76042659).

Almost surely, 2^505780805 is an apocalyptic number.

It is an amenable number.

505780805 is a deficient number, since it is larger than the sum of its proper divisors (102560467).

505780805 is a wasteful number, since it uses less digits than its factorization.

505780805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234055.

The product of its (nonzero) digits is 56000, while the sum is 38.

The square root of 505780805 is about 22489.5710274785. The cubic root of 505780805 is about 796.7476314796.

The spelling of 505780805 in words is "five hundred five million, seven hundred eighty thousand, eight hundred five".