85215500 has 48 divisors (see below), whose sum is σ = 187675488. Its totient is φ = 33800000.

The previous prime is 85215499. The next prime is 85215503. The reversal of 85215500 is 551258.

It is a self number, because there is not a number n which added to its sum of digits gives 85215500.

It is not an unprimeable number, because it can be changed into a prime (85215503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64850 + ... + 66150.

It is an arithmetic number, because the mean of its divisors is an integer number (3909906).

Almost surely, 2^85215500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93837744).

85215500 is an abundant number, since it is smaller than the sum of its proper divisors (102459988).

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

85215500 is a wasteful number, since it uses less digits than its factorization.

85215500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 1439 counting only the distinct ones).

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

The square root of 85215500 is about 9231.2241875062. The cubic root of 85215500 is about 440.0542288534.

Adding to 85215500 its reverse (551258), we get a palindrome (85766758).

The spelling of 85215500 in words is "eighty-five million, two hundred fifteen thousand, five hundred".