53728889 has 2 divisors, whose sum is σ = 53728890. Its totient is φ = 53728888.

The previous prime is 53728879. The next prime is 53728907. The reversal of 53728889 is 98882735.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 18207289 = 5960^2 + 4267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53728889 is a prime.

It is not a weakly prime, because it can be changed into another prime (53728879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26864444 + 26864445.

It is an arithmetic number, because the mean of its divisors is an integer number (26864445).

Almost surely, 2^53728889 is an apocalyptic number.

It is an amenable number.

53728889 is a deficient number, since it is larger than the sum of its proper divisors (1).

53728889 is an equidigital number, since it uses as much as digits as its factorization.

53728889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 50.

The square root of 53728889 is about 7329.9992496589. Note that the first 3 decimals coincide. The cubic root of 53728889 is about 377.3427007175.

The spelling of 53728889 in words is "fifty-three million, seven hundred twenty-eight thousand, eight hundred eighty-nine".