285556240 has 20 divisors (see below), whose sum is σ = 663918444. Its totient is φ = 114222464.

The previous prime is 285556213. The next prime is 285556307. The reversal of 285556240 is 42655582.

It can be written as a sum of positive squares in 2 ways, for example, as 59474944 + 226081296 = 7712^2 + 15036^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 285556240.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784647 + ... + 1784806.

Almost surely, 2^285556240 is an apocalyptic number.

285556240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285556240 is an abundant number, since it is smaller than the sum of its proper divisors (378362204).

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

285556240 is a wasteful number, since it uses less digits than its factorization.

285556240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569466 (or 3569460 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

The square root of 285556240 is about 16898.4093926026. The cubic root of 285556240 is about 658.5122903261.

It can be divided in two parts, 2855 and 56240, that added together give a palindrome (59095).

The spelling of 285556240 in words is "two hundred eighty-five million, five hundred fifty-six thousand, two hundred forty".