505555440 has 160 divisors (see below), whose sum is σ = 1742555136. Its totient is φ = 120407040.

The previous prime is 505555423. The next prime is 505555447. The reversal of 505555440 is 44555505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505555447) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 94107 + ... + 99333.

Almost surely, 2^505555440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505555440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871277568).

505555440 is an abundant number, since it is smaller than the sum of its proper divisors (1236999696).

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

505555440 is a wasteful number, since it uses less digits than its factorization.

505555440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287 (or 5281 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 33.

The square root of 505555440 is about 22484.5600357223. The cubic root of 505555440 is about 796.6292760550.

The spelling of 505555440 in words is "five hundred five million, five hundred fifty-five thousand, four hundred forty".