285728730 has 32 divisors (see below), whose sum is σ = 783713664. Its totient is φ = 65309376.

The previous prime is 285728717. The next prime is 285728761. The reversal of 285728730 is 37827582.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 680097 + ... + 680516.

It is an arithmetic number, because the mean of its divisors is an integer number (24491052).

Almost surely, 2^285728730 is an apocalyptic number.

285728730 is an abundant number, since it is smaller than the sum of its proper divisors (497984934).

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

285728730 is a wasteful number, since it uses less digits than its factorization.

285728730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360630.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 285728730 is about 16903.5123569038. The cubic root of 285728730 is about 658.6448548978.

The spelling of 285728730 in words is "two hundred eighty-five million, seven hundred twenty-eight thousand, seven hundred thirty".