285347780861 has 32 divisors (see below), whose sum is σ = 338048409216. Its totient is φ = 237450528000.

The previous prime is 285347780857. The next prime is 285347780867. The reversal of 285347780861 is 168087743582.

It is a cyclic number.

It is not a de Polignac number, because 285347780861 - 2² = 285347780857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285347780861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285347780867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8340851 + ... + 8374991.

It is an arithmetic number, because the mean of its divisors is an integer number (10564012788).

Almost surely, 2^285347780861 is an apocalyptic number.

It is an amenable number.

285347780861 is a deficient number, since it is larger than the sum of its proper divisors (52700628355).

285347780861 is a wasteful number, since it uses less digits than its factorization.

285347780861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34653.

The product of its (nonzero) digits is 18063360, while the sum is 59.

The spelling of 285347780861 in words is "two hundred eighty-five billion, three hundred forty-seven million, seven hundred eighty thousand, eight hundred sixty-one".