285729320 has 16 divisors (see below), whose sum is σ = 642891060. Its totient is φ = 114291712.

The previous prime is 285729293. The next prime is 285729337. The reversal of 285729320 is 23927582.

It can be written as a sum of positive squares in 2 ways, for example, as 233050756 + 52678564 = 15266^2 + 7258^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3571577 + ... + 3571656.

Almost surely, 2^285729320 is an apocalyptic number.

285729320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285729320 is an abundant number, since it is smaller than the sum of its proper divisors (357161740).

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

285729320 is a wasteful number, since it uses less digits than its factorization.

285729320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143244 (or 7143240 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 285729320 is about 16903.5298088890. The cubic root of 285729320 is about 658.6453082418.

The spelling of 285729320 in words is "two hundred eighty-five million, seven hundred twenty-nine thousand, three hundred twenty".