85717805 has 4 divisors (see below), whose sum is σ = 102861372. Its totient is φ = 68574240.

The previous prime is 85717787. The next prime is 85717813. The reversal of 85717805 is 50871758.

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 63712324 + 22005481 = 7982^2 + 4691^2 .

It is not a de Polignac number, because 85717805 - 2⁶ = 85717741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8571776 + ... + 8571785.

It is an arithmetic number, because the mean of its divisors is an integer number (25715343).

Almost surely, 2^85717805 is an apocalyptic number.

It is an amenable number.

85717805 is a deficient number, since it is larger than the sum of its proper divisors (17143567).

85717805 is a wasteful number, since it uses less digits than its factorization.

85717805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17143566.

The product of its (nonzero) digits is 78400, while the sum is 41.

The square root of 85717805 is about 9258.3910589260. The cubic root of 85717805 is about 440.9171725846.

The spelling of 85717805 in words is "eighty-five million, seven hundred seventeen thousand, eight hundred five".