285521472 has 84 divisors (see below), whose sum is σ = 846665820. Its totient is φ = 91886592.

The previous prime is 285521461. The next prime is 285521491. The reversal of 285521472 is 274125582.

It is a happy number.

285521472 is a `hidden beast` number, since 28 + 552 + 14 + 72 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 153363456 + 132158016 = 12384^2 + 11496^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8158 + ... + 25250.

It is an arithmetic number, because the mean of its divisors is an integer number (10079355).

Almost surely, 2^285521472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285521472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423332910).

285521472 is an abundant number, since it is smaller than the sum of its proper divisors (561144348).

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

285521472 is a wasteful number, since it uses less digits than its factorization.

285521472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17140 (or 17127 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 285521472 is about 16897.3806254106. The cubic root of 285521472 is about 658.4855634432.

The spelling of 285521472 in words is "two hundred eighty-five million, five hundred twenty-one thousand, four hundred seventy-two".