285642565 has 24 divisors (see below), whose sum is σ = 375606504. Its totient is φ = 207302400.

The previous prime is 285642527. The next prime is 285642571. The reversal of 285642565 is 565246582.

It can be written as a sum of positive squares in 12 ways, for example, as 206468161 + 79174404 = 14369^2 + 8898^2 .

It is not a de Polignac number, because 285642565 - 2⁹ = 285642053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241275 + ... + 242455.

It is an arithmetic number, because the mean of its divisors is an integer number (15650271).

Almost surely, 2^285642565 is an apocalyptic number.

It is an amenable number.

285642565 is a deficient number, since it is larger than the sum of its proper divisors (89963939).

285642565 is a wasteful number, since it uses less digits than its factorization.

285642565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1260 counting only the distinct ones).

The product of its digits is 576000, while the sum is 43.

The square root of 285642565 is about 16900.9634340768. The cubic root of 285642565 is about 658.5786407657.

The spelling of 285642565 in words is "two hundred eighty-five million, six hundred forty-two thousand, five hundred sixty-five".