505557765 has 24 divisors (see below), whose sum is σ = 904570368. Its totient is φ = 260932320.

The previous prime is 505557761. The next prime is 505557809. The reversal of 505557765 is 567755505.

It is not a de Polignac number, because 505557765 - 2² = 505557761 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 505557765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505557761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179809 + ... + 182598.

It is an arithmetic number, because the mean of its divisors is an integer number (37690432).

Almost surely, 2^505557765 is an apocalyptic number.

It is an amenable number.

505557765 is a deficient number, since it is larger than the sum of its proper divisors (399012603).

505557765 is a wasteful number, since it uses less digits than its factorization.

505557765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362449 (or 362446 counting only the distinct ones).

The product of its (nonzero) digits is 918750, while the sum is 45.

The square root of 505557765 is about 22484.6117378086. The cubic root of 505557765 is about 796.6304972598.

The spelling of 505557765 in words is "five hundred five million, five hundred fifty-seven thousand, seven hundred sixty-five".