505728678 has 64 divisors (see below), whose sum is σ = 1247726592. Its totient is φ = 133073280.

The previous prime is 505728667. The next prime is 505728731. The reversal of 505728678 is 876827505.

It is a super-2 number, since 2×505728678² = 511522991503255368, which contains 22 as substring.

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, 333943 + ... + 335453.

It is an arithmetic number, because the mean of its divisors is an integer number (19495728).

Almost surely, 2^505728678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505728678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (623863296).

505728678 is an abundant number, since it is smaller than the sum of its proper divisors (741997914).

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

505728678 is a wasteful number, since it uses less digits than its factorization.

505728678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149.

The product of its (nonzero) digits is 940800, while the sum is 48.

The square root of 505728678 is about 22488.4120826705. The cubic root of 505728678 is about 796.7202589563.

The spelling of 505728678 in words is "five hundred five million, seven hundred twenty-eight thousand, six hundred seventy-eight".