285458440 has 16 divisors (see below), whose sum is σ = 642281580. Its totient is φ = 114183360.

The previous prime is 285458431. The next prime is 285458443. The reversal of 285458440 is 44854582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 270076356 + 15382084 = 16434^2 + 3922^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 7136461 = 285458440 / (2 + 8 + 5 + 4 + 5 + 8 + 4 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 285458393 and 285458402.

It is not an unprimeable number, because it can be changed into a prime (285458443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3568191 + ... + 3568270.

Almost surely, 2^285458440 is an apocalyptic number.

285458440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285458440 is an abundant number, since it is smaller than the sum of its proper divisors (356823140).

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

285458440 is a wasteful number, since it uses less digits than its factorization.

285458440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136472 (or 7136468 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 40.

The square root of 285458440 is about 16895.5153813075. The cubic root of 285458440 is about 658.4371039042.

The spelling of 285458440 in words is "two hundred eighty-five million, four hundred fifty-eight thousand, four hundred forty".