285680408989 has 8 divisors (see below), whose sum is σ = 287194470392. Its totient is φ = 284166696960.

The previous prime is 285680408863. The next prime is 285680409013. The reversal of 285680408989 is 989804086582.

It can be written as a sum of positive squares in 4 ways, for example, as 5265679225 + 280414729764 = 72565^2 + 529542^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285680408989 - 2¹⁹ = 285679884701 is a prime.

It is a super-2 number, since 2×285680408989² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285680408389) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1642837 + ... + 1808389.

It is an arithmetic number, because the mean of its divisors is an integer number (35899308799).

Almost surely, 2^285680408989 is an apocalyptic number.

It is an amenable number.

285680408989 is a deficient number, since it is larger than the sum of its proper divisors (1514061403).

285680408989 is a wasteful number, since it uses less digits than its factorization.

285680408989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174687.

The product of its (nonzero) digits is 79626240, while the sum is 67.

The spelling of 285680408989 in words is "two hundred eighty-five billion, six hundred eighty million, four hundred eight thousand, nine hundred eighty-nine".