285660648 has 128 divisors (see below), whose sum is σ = 976684800. Its totient is φ = 75333888.

The previous prime is 285660647. The next prime is 285660671. The reversal of 285660648 is 846066582.

285660648 is a `hidden beast` number, since 28 + 566 + 0 + 64 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (285660647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12390 + ... + 26922.

It is an arithmetic number, because the mean of its divisors is an integer number (7630350).

Almost surely, 2^285660648 is an apocalyptic number.

285660648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285660648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (488342400).

285660648 is an abundant number, since it is smaller than the sum of its proper divisors (691024152).

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

285660648 is a wasteful number, since it uses less digits than its factorization.

285660648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14568 (or 14558 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 285660648 is about 16901.4983951128. The cubic root of 285660648 is about 658.5925378848.

It can be divided in two parts, 2856 and 60648, that added together give a square (63504 = 252²).

The spelling of 285660648 in words is "two hundred eighty-five million, six hundred sixty thousand, six hundred forty-eight".