285661979776 has 48 divisors (see below), whose sum is σ = 584889154290. Its totient is φ = 138970607616.

The previous prime is 285661979749. The next prime is 285661979783. The reversal of 285661979776 is 677979166582.

It can be written as a sum of positive squares in 3 ways, for example, as 281723162176 + 3938817600 = 530776^2 + 62760^2 .

It is a junction number, because it is equal to n+sod(n) for n = 285661979699 and 285661979708.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 639865 + ... + 990328.

Almost surely, 2^285661979776 is an apocalyptic number.

It is an amenable number.

285661979776 is an abundant number, since it is smaller than the sum of its proper divisors (299227174514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285661979776 is an equidigital number, since it uses as much as digits as its factorization.

285661979776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630281 (or 1630232 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 73.

The spelling of 285661979776 in words is "two hundred eighty-five billion, six hundred sixty-one million, nine hundred seventy-nine thousand, seven hundred seventy-six".