820284259 has 4 divisors (see below), whose sum is σ = 855948816. Its totient is φ = 784619704.

The previous prime is 820284251. The next prime is 820284277. The reversal of 820284259 is 952482028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820284259 - 2³ = 820284251 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820284251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17832244 + ... + 17832289.

It is an arithmetic number, because the mean of its divisors is an integer number (213987204).

Almost surely, 2^820284259 is an apocalyptic number.

820284259 is a deficient number, since it is larger than the sum of its proper divisors (35664557).

820284259 is a wasteful number, since it uses less digits than its factorization.

820284259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35664556.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 820284259 is about 28640.6050739156. The cubic root of 820284259 is about 936.0983057650.

The spelling of 820284259 in words is "eight hundred twenty million, two hundred eighty-four thousand, two hundred fifty-nine".