285628 has 18 divisors (see below), whose sum is σ = 576968. Its totient is φ = 121200.

The previous prime is 285613. The next prime is 285629. The reversal of 285628 is 826582.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 285628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2778 + ... + 2878.

2²⁸⁵⁶²⁸ is an apocalyptic number.

285628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

285628 is an abundant number, since it is smaller than the sum of its proper divisors (291340).

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

285628 is a wasteful number, since it uses less digits than its factorization.

285628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 110 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 285628 is about 534.4417648350. The cubic root of 285628 is about 65.8567446868.

The spelling of 285628 in words is "two hundred eighty-five thousand, six hundred twenty-eight".