505655500 has 72 divisors (see below), whose sum is σ = 1284716160. Its totient is φ = 173359200.

The previous prime is 505655473. The next prime is 505655543. The reversal of 505655500 is 5556505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14181 + ... + 34819.

It is an arithmetic number, because the mean of its divisors is an integer number (17843280).

Almost surely, 2^505655500 is an apocalyptic number.

505655500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505655500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642358080).

505655500 is an abundant number, since it is smaller than the sum of its proper divisors (779060660).

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

505655500 is a wasteful number, since it uses less digits than its factorization.

505655500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20672 (or 20653 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 31.

The square root of 505655500 is about 22486.7850080886. The cubic root of 505655500 is about 796.6818291223.

It can be divided in two parts, 50565 and 5500, that added together give a palindrome (56065).

The spelling of 505655500 in words is "five hundred five million, six hundred fifty-five thousand, five hundred".