85769729 has 2 divisors, whose sum is σ = 85769730. Its totient is φ = 85769728.

The previous prime is 85769711. The next prime is 85769753. The reversal of 85769729 is 92796758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82446400 + 3323329 = 9080^2 + 1823^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85769729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85769759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42884864 + 42884865.

It is an arithmetic number, because the mean of its divisors is an integer number (42884865).

Almost surely, 2^85769729 is an apocalyptic number.

It is an amenable number.

85769729 is a deficient number, since it is larger than the sum of its proper divisors (1).

85769729 is an equidigital number, since it uses as much as digits as its factorization.

85769729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The square root of 85769729 is about 9261.1947933299. The cubic root of 85769729 is about 441.0061838936.

The spelling of 85769729 in words is "eighty-five million, seven hundred sixty-nine thousand, seven hundred twenty-nine".