89728861 has 2 divisors, whose sum is σ = 89728862. Its totient is φ = 89728860.

The previous prime is 89728799. The next prime is 89728867. The reversal of 89728861 is 16882798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89680900 + 47961 = 9470^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 89728861 - 2¹⁷ = 89597789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89728867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44864430 + 44864431.

It is an arithmetic number, because the mean of its divisors is an integer number (44864431).

Almost surely, 2^89728861 is an apocalyptic number.

It is an amenable number.

89728861 is a deficient number, since it is larger than the sum of its proper divisors (1).

89728861 is an equidigital number, since it uses as much as digits as its factorization.

89728861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 89728861 is about 9472.5319212975. The cubic root of 89728861 is about 447.6899910048.

The spelling of 89728861 in words is "eighty-nine million, seven hundred twenty-eight thousand, eight hundred sixty-one".