85142220 has 24 divisors (see below), whose sum is σ = 238398384. Its totient is φ = 22704576.

The previous prime is 85142203. The next prime is 85142227. The reversal of 85142220 is 2224158.

It is not an unprimeable number, because it can be changed into a prime (85142227) 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, 709459 + ... + 709578.

It is an arithmetic number, because the mean of its divisors is an integer number (9933266).

Almost surely, 2^85142220 is an apocalyptic number.

It is an amenable number.

85142220 is an abundant number, since it is smaller than the sum of its proper divisors (153256164).

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

85142220 is a wasteful number, since it uses less digits than its factorization.

85142220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419049 (or 1419047 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 85142220 is about 9227.2541961301. The cubic root of 85142220 is about 439.9280529744.

Adding to 85142220 its reverse (2224158), we get a palindrome (87366378).

It can be divided in two parts, 851 and 42220, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 85142220 in words is "eighty-five million, one hundred forty-two thousand, two hundred twenty".