285320144 has 20 divisors (see below), whose sum is σ = 557882820. Its totient is φ = 141350400.

The previous prime is 285320143. The next prime is 285320251. The reversal of 285320144 is 441023582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 193543744 + 91776400 = 13912^2 + 9580^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285320143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80057 + ... + 83544.

It is an arithmetic number, because the mean of its divisors is an integer number (27894141).

Almost surely, 2^285320144 is an apocalyptic number.

It is an amenable number.

285320144 is a deficient number, since it is larger than the sum of its proper divisors (272562676).

285320144 is a wasteful number, since it uses less digits than its factorization.

285320144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163718 (or 163712 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 285320144 is about 16891.4222018159. The cubic root of 285320144 is about 658.3307557591.

The spelling of 285320144 in words is "two hundred eighty-five million, three hundred twenty thousand, one hundred forty-four".