285071220 has 108 divisors (see below), whose sum is σ = 1005925284. Its totient is φ = 65157120.

The previous prime is 285071203. The next prime is 285071221. The reversal of 285071220 is 22170582.

It can be written as a sum of positive squares in 2 ways, for example, as 103306896 + 181764324 = 10164^2 + 13482^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285071221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7341 + ... + 24980.

It is an arithmetic number, because the mean of its divisors is an integer number (9314123).

Almost surely, 2^285071220 is an apocalyptic number.

285071220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285071220 is an abundant number, since it is smaller than the sum of its proper divisors (720854064).

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

285071220 is a wasteful number, since it uses less digits than its factorization.

285071220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32350 (or 32338 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 285071220 is about 16884.0522387252. The cubic root of 285071220 is about 658.1392492376.

The spelling of 285071220 in words is "two hundred eighty-five million, seventy-one thousand, two hundred twenty".