285820642 has 4 divisors (see below), whose sum is σ = 428730966. Its totient is φ = 142910320.

The previous prime is 285820631. The next prime is 285820673. The reversal of 285820642 is 246028582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246028582 = 2 ⋅123014291.

It can be written as a sum of positive squares in only one way, i.e., 158785201 + 127035441 = 12601^2 + 11271^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71455159 + ... + 71455162.

Almost surely, 2^285820642 is an apocalyptic number.

285820642 is a deficient number, since it is larger than the sum of its proper divisors (142910324).

285820642 is a wasteful number, since it uses less digits than its factorization.

285820642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142910323.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 285820642 is about 16906.2308632054. The cubic root of 285820642 is about 658.7154706831.

The spelling of 285820642 in words is "two hundred eighty-five million, eight hundred twenty thousand, six hundred forty-two".