87665729 has 2 divisors, whose sum is σ = 87665730. Its totient is φ = 87665728.

The previous prime is 87665717. The next prime is 87665741. The reversal of 87665729 is 92756678.

It is a balanced prime because it is at equal distance from previous prime (87665717) and next prime (87665741).

It can be written as a sum of positive squares in only one way, i.e., 75777025 + 11888704 = 8705^2 + 3448^2 .

It is a cyclic number.

It is not a de Polignac number, because 87665729 - 2²⁴ = 70888513 is a prime.

It is a super-2 number, since 2×87665729² = 15370560082202882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87665779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43832864 + 43832865.

It is an arithmetic number, because the mean of its divisors is an integer number (43832865).

Almost surely, 2^87665729 is an apocalyptic number.

It is an amenable number.

87665729 is a deficient number, since it is larger than the sum of its proper divisors (1).

87665729 is an equidigital number, since it uses as much as digits as its factorization.

87665729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 87665729 is about 9362.9978639323. The cubic root of 87665729 is about 444.2321125591.

The spelling of 87665729 in words is "eighty-seven million, six hundred sixty-five thousand, seven hundred twenty-nine".