505640856 has 128 divisors (see below), whose sum is σ = 1483776000. Its totient is φ = 140614272.

The previous prime is 505640831. The next prime is 505640867. The reversal of 505640856 is 658046505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1377585 + ... + 1377951.

It is an arithmetic number, because the mean of its divisors is an integer number (11592000).

Almost surely, 2^505640856 is an apocalyptic number.

505640856 is a gapful number since it is divisible by the number (56) 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 505640856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741888000).

505640856 is an abundant number, since it is smaller than the sum of its proper divisors (978135144).

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

505640856 is a wasteful number, since it uses less digits than its factorization.

505640856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The square root of 505640856 is about 22486.4593922654. The cubic root of 505640856 is about 796.6741382990.

The spelling of 505640856 in words is "five hundred five million, six hundred forty thousand, eight hundred fifty-six".