285222216528 has 90 divisors (see below), whose sum is σ = 834440702186. Its totient is φ = 90940392576.

The previous prime is 285222216527. The next prime is 285222216557. The reversal of 285222216528 is 825612222582.

It is a happy number.

285222216528 is a `hidden beast` number, since 2 + 85 + 2 + 22 + 21 + 6 + 528 = 666.

It can be written as a sum of positive squares in only one way, i.e., 152090640144 + 133131576384 = 389988^2 + 364872^2 .

It is a super-2 number, since 2×285222216528² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285222216527) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1795951 + ... + 1948302.

Almost surely, 2^285222216528 is an apocalyptic number.

It is an amenable number.

285222216528 is an abundant number, since it is smaller than the sum of its proper divisors (549218485658).

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

285222216528 is a wasteful number, since it uses less digits than its factorization.

285222216528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744313 (or 3744281 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The spelling of 285222216528 in words is "two hundred eighty-five billion, two hundred twenty-two million, two hundred sixteen thousand, five hundred twenty-eight".