505727765 has 4 divisors (see below), whose sum is σ = 606873324. Its totient is φ = 404582208.

The previous prime is 505727753. The next prime is 505727767. The reversal of 505727765 is 567727505.

It is a happy number.

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 402644356 + 103083409 = 20066^2 + 10153^2 .

It is a cyclic number.

It is not a de Polignac number, because 505727765 - 2⁶ = 505727701 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 (505727767) 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, 50572772 + ... + 50572781.

It is an arithmetic number, because the mean of its divisors is an integer number (151718331).

Almost surely, 2^505727765 is an apocalyptic number.

It is an amenable number.

505727765 is a deficient number, since it is larger than the sum of its proper divisors (101145559).

505727765 is a wasteful number, since it uses less digits than its factorization.

505727765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101145558.

The product of its (nonzero) digits is 514500, while the sum is 44.

The square root of 505727765 is about 22488.3917833179. The cubic root of 505727765 is about 796.7197795121.

The spelling of 505727765 in words is "five hundred five million, seven hundred twenty-seven thousand, seven hundred sixty-five".