97708729 has 2 divisors, whose sum is σ = 97708730. Its totient is φ = 97708728.

The previous prime is 97708717. The next prime is 97708747. The reversal of 97708729 is 92780779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60217600 + 37491129 = 7760^2 + 6123^2 .

It is a cyclic number.

It is not a de Polignac number, because 97708729 - 2⁹ = 97708217 is a prime.

It is not a weakly prime, because it can be changed into another prime (97708789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48854364 + 48854365.

It is an arithmetic number, because the mean of its divisors is an integer number (48854365).

Almost surely, 2^97708729 is an apocalyptic number.

It is an amenable number.

97708729 is a deficient number, since it is larger than the sum of its proper divisors (1).

97708729 is an equidigital number, since it uses as much as digits as its factorization.

97708729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 97708729 is about 9884.7725821083. The cubic root of 97708729 is about 460.5864118549.

The spelling of 97708729 in words is "ninety-seven million, seven hundred eight thousand, seven hundred twenty-nine".