85171777 has 8 divisors (see below), whose sum is σ = 87486080. Its totient is φ = 82872720.

The previous prime is 85171771. The next prime is 85171781. The reversal of 85171777 is 77717158.

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

It is a cyclic number.

It is not a de Polignac number, because 85171777 - 2³ = 85171769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (85171771) 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, 7999 + ... + 15307.

It is an arithmetic number, because the mean of its divisors is an integer number (10935760).

Almost surely, 2^85171777 is an apocalyptic number.

It is an amenable number.

85171777 is a deficient number, since it is larger than the sum of its proper divisors (2314303).

85171777 is a wasteful number, since it uses less digits than its factorization.

85171777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7623.

The product of its digits is 96040, while the sum is 43.

The square root of 85171777 is about 9228.8556712086. The cubic root of 85171777 is about 439.9789538831.

The spelling of 85171777 in words is "eighty-five million, one hundred seventy-one thousand, seven hundred seventy-seven".