505555785 has 72 divisors (see below), whose sum is σ = 1028893320. Its totient is φ = 228953088.

The previous prime is 505555759. The next prime is 505555807. The reversal of 505555785 is 587555505.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57471561 + 448084224 = 7581^2 + 21168^2 .

It is not a de Polignac number, because 505555785 - 2⁸ = 505555529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 505555785.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 248151 + ... + 250179.

It is an arithmetic number, because the mean of its divisors is an integer number (14290185).

Almost surely, 2^505555785 is an apocalyptic number.

It is an amenable number.

505555785 is an abundant number, since it is smaller than the sum of its proper divisors (523337535).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505555785 is a wasteful number, since it uses less digits than its factorization.

505555785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167 (or 2157 counting only the distinct ones).

The product of its (nonzero) digits is 875000, while the sum is 45.

The square root of 505555785 is about 22484.5677076523. The cubic root of 505555785 is about 796.6294572663.

The spelling of 505555785 in words is "five hundred five million, five hundred fifty-five thousand, seven hundred eighty-five".