85660220 has 24 divisors (see below), whose sum is σ = 180306000. Its totient is φ = 34184192.

The previous prime is 85660219. The next prime is 85660231. The reversal of 85660220 is 2206658.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4211 + ... + 13749.

It is an arithmetic number, because the mean of its divisors is an integer number (7512750).

Almost surely, 2^85660220 is an apocalyptic number.

It is an amenable number.

85660220 is an abundant number, since it is smaller than the sum of its proper divisors (94645780).

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

85660220 is a wasteful number, since it uses less digits than its factorization.

85660220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9997 (or 9995 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 85660220 is about 9255.2806548478. The cubic root of 85660220 is about 440.8184147937.

Adding to 85660220 its reverse (2206658), we get a palindrome (87866878).

The spelling of 85660220 in words is "eighty-five million, six hundred sixty thousand, two hundred twenty".