53681728 has 14 divisors (see below), whose sum is σ = 106524806. Its totient is φ = 26840832.

The previous prime is 53681723. The next prime is 53681729. The reversal of 53681728 is 82718635.

It can be written as a sum of positive squares in only one way, i.e., 27793984 + 25887744 = 5272^2 + 5088^2 .

It is not an unprimeable number, because it can be changed into a prime (53681723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419325 + ... + 419452.

Almost surely, 2^53681728 is an apocalyptic number.

It is an amenable number.

53681728 is a deficient number, since it is larger than the sum of its proper divisors (52843078).

53681728 is an equidigital number, since it uses as much as digits as its factorization.

53681728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838789 (or 838779 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 53681728 is about 7326.7815580922. The cubic root of 53681728 is about 377.2322631186.

The spelling of 53681728 in words is "fifty-three million, six hundred eighty-one thousand, seven hundred twenty-eight".