285328421 has 6 divisors (see below), whose sum is σ = 331912710. Its totient is φ = 244567176.

The previous prime is 285328387. The next prime is 285328441. The reversal of 285328421 is 124823582.

It can be written as a sum of positive squares in only one way, i.e., 205922500 + 79405921 = 14350^2 + 8911^2 .

It is a de Polignac number, because none of the positive numbers 2^k-285328421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285328441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2911466 + ... + 2911563.

It is an arithmetic number, because the mean of its divisors is an integer number (55318785).

Almost surely, 2^285328421 is an apocalyptic number.

It is an amenable number.

285328421 is a deficient number, since it is larger than the sum of its proper divisors (46584289).

285328421 is an equidigital number, since it uses as much as digits as its factorization.

285328421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823043 (or 5823036 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 285328421 is about 16891.6672060516. The cubic root of 285328421 is about 658.3371216503.

The spelling of 285328421 in words is "two hundred eighty-five million, three hundred twenty-eight thousand, four hundred twenty-one".