85217285 has 8 divisors (see below), whose sum is σ = 102310296. Its totient is φ = 68140800.

The previous prime is 85217281. The next prime is 85217291. The reversal of 85217285 is 58271258.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 264196 + 84953089 = 514^2 + 9217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85217285 - 2² = 85217281 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85217281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18185 + ... + 22385.

It is an arithmetic number, because the mean of its divisors is an integer number (12788787).

Almost surely, 2^85217285 is an apocalyptic number.

It is an amenable number.

85217285 is a deficient number, since it is larger than the sum of its proper divisors (17093011).

85217285 is a wasteful number, since it uses less digits than its factorization.

85217285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263.

The product of its digits is 44800, while the sum is 38.

The square root of 85217285 is about 9231.3208697347. The cubic root of 85217285 is about 440.0573014216.

The spelling of 85217285 in words is "eighty-five million, two hundred seventeen thousand, two hundred eighty-five".