85105520 has 60 divisors (see below), whose sum is σ = 206950296. Its totient is φ = 32545920.

The previous prime is 85105511. The next prime is 85105523. The reversal of 85105520 is 2550158.

It is a self number, because there is not a number n which added to its sum of digits gives 85105520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85105523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41315 + ... + 43325.

Almost surely, 2^85105520 is an apocalyptic number.

85105520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85105520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103475148).

85105520 is an abundant number, since it is smaller than the sum of its proper divisors (121844776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85105520 is a wasteful number, since it uses less digits than its factorization.

85105520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 85105520 is about 9225.2653078380. The cubic root of 85105520 is about 439.8648345152.

Adding to 85105520 its reverse (2550158), we get a palindrome (87655678).

The spelling of 85105520 in words is "eighty-five million, one hundred five thousand, five hundred twenty".