56905728 has 104 divisors (see below), whose sum is σ = 165916896. Its totient is φ = 17203200.

The previous prime is 56905721. The next prime is 56905747. The reversal of 56905728 is 82750965.

It is a self number, because there is not a number n which added to its sum of digits gives 56905728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56905721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134958 + ... + 135378.

Almost surely, 2^56905728 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 56905728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82958448).

56905728 is an abundant number, since it is smaller than the sum of its proper divisors (109011168).

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

56905728 is a wasteful number, since it uses less digits than its factorization.

56905728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 56905728 is about 7543.5885359688. The cubic root of 56905728 is about 384.6378288605.

The spelling of 56905728 in words is "fifty-six million, nine hundred five thousand, seven hundred twenty-eight".