505831086728 has 32 divisors (see below), whose sum is σ = 1040370851520. Its totient is φ = 228652920000.

The previous prime is 505831086701. The next prime is 505831086751. The reversal of 505831086728 is 827680138505.

It is a self number, because there is not a number n which added to its sum of digits gives 505831086728.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15862748 + ... + 15894603.

It is an arithmetic number, because the mean of its divisors is an integer number (32511589110).

Almost surely, 2^505831086728 is an apocalyptic number.

It is an amenable number.

505831086728 is an abundant number, since it is smaller than the sum of its proper divisors (534539764792).

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

505831086728 is a wasteful number, since it uses less digits than its factorization.

505831086728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31757549 (or 31757545 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 53.

It can be divided in two parts, 50583 and 1086728, that added together give a palindrome (1137311).

The spelling of 505831086728 in words is "five hundred five billion, eight hundred thirty-one million, eighty-six thousand, seven hundred twenty-eight".