85210729 has 4 divisors (see below), whose sum is σ = 88149060. Its totient is φ = 82272400.

The previous prime is 85210711. The next prime is 85210733. The reversal of 85210729 is 92701258.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31584400 + 53626329 = 5620^2 + 7323^2 .

It is a cyclic number.

It is not a de Polignac number, because 85210729 - 2¹¹ = 85208681 is a prime.

It is a super-2 number, since 2×85210729² = 14521736673422882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85210694 and 85210703.

It is not an unprimeable number, because it can be changed into a prime (85210709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469122 + ... + 1469179.

It is an arithmetic number, because the mean of its divisors is an integer number (22037265).

Almost surely, 2^85210729 is an apocalyptic number.

It is an amenable number.

85210729 is a deficient number, since it is larger than the sum of its proper divisors (2938331).

85210729 is a wasteful number, since it uses less digits than its factorization.

85210729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938330.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 85210729 is about 9230.9657674590. The cubic root of 85210729 is about 440.0460161929.

The spelling of 85210729 in words is "eighty-five million, two hundred ten thousand, seven hundred twenty-nine".