85217615 has 24 divisors (see below), whose sum is σ = 121738320. Its totient is φ = 57068928.

The previous prime is 85217611. The next prime is 85217621. The reversal of 85217615 is 51671258.

It is not a de Polignac number, because 85217615 - 2² = 85217611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85217611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6491 + ... + 14579.

It is an arithmetic number, because the mean of its divisors is an integer number (5072430).

Almost surely, 2^85217615 is an apocalyptic number.

85217615 is a deficient number, since it is larger than the sum of its proper divisors (36520705).

85217615 is a wasteful number, since it uses less digits than its factorization.

85217615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151 (or 8144 counting only the distinct ones).

The product of its digits is 16800, while the sum is 35.

The square root of 85217615 is about 9231.3387436493. The cubic root of 85217615 is about 440.0578694547.

The spelling of 85217615 in words is "eighty-five million, two hundred seventeen thousand, six hundred fifteen".