85128220 has 48 divisors (see below), whose sum is σ = 182750400. Its totient is φ = 33302016.

The previous prime is 85128191. The next prime is 85128269. The reversal of 85128220 is 2282158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290394 + ... + 290686.

It is an arithmetic number, because the mean of its divisors is an integer number (3807300).

Almost surely, 2^85128220 is an apocalyptic number.

It is an amenable number.

85128220 is an abundant number, since it is smaller than the sum of its proper divisors (97622180).

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

85128220 is a wasteful number, since it uses less digits than its factorization.

85128220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 85128220 is about 9226.4955427291. The cubic root of 85128220 is about 439.9039390846.

The spelling of 85128220 in words is "eighty-five million, one hundred twenty-eight thousand, two hundred twenty".