285220730 has 32 divisors (see below), whose sum is σ = 546393600. Its totient is φ = 106824960.

The previous prime is 285220697. The next prime is 285220751. The reversal of 285220730 is 37022582.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 285220693 and 285220702.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29615 + ... + 38045.

It is an arithmetic number, because the mean of its divisors is an integer number (17074800).

Almost surely, 2^285220730 is an apocalyptic number.

285220730 is a deficient number, since it is larger than the sum of its proper divisors (261172870).

285220730 is a wasteful number, since it uses less digits than its factorization.

285220730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8654.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 285220730 is about 16888.4792092124. The cubic root of 285220730 is about 658.2542862238.

The spelling of 285220730 in words is "two hundred eighty-five million, two hundred twenty thousand, seven hundred thirty".