285728461 has 2 divisors, whose sum is σ = 285728462. Its totient is φ = 285728460.

The previous prime is 285728447. The next prime is 285728491. The reversal of 285728461 is 164827582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249956100 + 35772361 = 15810^2 + 5981^2 .

It is a cyclic number.

It is not a de Polignac number, because 285728461 - 2¹³ = 285720269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285728411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142864230 + 142864231.

It is an arithmetic number, because the mean of its divisors is an integer number (142864231).

Almost surely, 2^285728461 is an apocalyptic number.

It is an amenable number.

285728461 is a deficient number, since it is larger than the sum of its proper divisors (1).

285728461 is an equidigital number, since it uses as much as digits as its factorization.

285728461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 43.

The square root of 285728461 is about 16903.5043999758. The cubic root of 285728461 is about 658.6446482035.

The spelling of 285728461 in words is "two hundred eighty-five million, seven hundred twenty-eight thousand, four hundred sixty-one".