99728729 has 2 divisors, whose sum is σ = 99728730. Its totient is φ = 99728728.

The previous prime is 99728723. The next prime is 99728743. The reversal of 99728729 is 92782799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87984400 + 11744329 = 9380^2 + 3427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99728729 is a prime.

It is not a weakly prime, because it can be changed into another prime (99728723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49864364 + 49864365.

It is an arithmetic number, because the mean of its divisors is an integer number (49864365).

Almost surely, 2^99728729 is an apocalyptic number.

It is an amenable number.

99728729 is a deficient number, since it is larger than the sum of its proper divisors (1).

99728729 is an equidigital number, since it uses as much as digits as its factorization.

99728729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 99728729 is about 9986.4272390080. The cubic root of 99728729 is about 463.7387937901.

The spelling of 99728729 in words is "ninety-nine million, seven hundred twenty-eight thousand, seven hundred twenty-nine".