285640730 has 8 divisors (see below), whose sum is σ = 514153332. Its totient is φ = 114256288.

The previous prime is 285640687. The next prime is 285640763. The reversal of 285640730 is 37046582.

It is a happy number.

285640730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 265918249 + 19722481 = 16307^2 + 4441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14282027 + ... + 14282046.

Almost surely, 2^285640730 is an apocalyptic number.

285640730 is a deficient number, since it is larger than the sum of its proper divisors (228512602).

285640730 is a wasteful number, since it uses less digits than its factorization.

285640730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28564080.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 285640730 is about 16900.9091471435. The cubic root of 285640730 is about 658.5772305016.

The spelling of 285640730 in words is "two hundred eighty-five million, six hundred forty thousand, seven hundred thirty".