820430287 has 8 divisors (see below), whose sum is σ = 828488192. Its totient is φ = 812397600.

The previous prime is 820430269. The next prime is 820430321. The reversal of 820430287 is 782034028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 820430287 - 2¹⁵ = 820397519 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 (820430227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62737 + ... + 74677.

It is an arithmetic number, because the mean of its divisors is an integer number (103561024).

Almost surely, 2^820430287 is an apocalyptic number.

820430287 is a deficient number, since it is larger than the sum of its proper divisors (8057905).

820430287 is a wasteful number, since it uses less digits than its factorization.

820430287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12609.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 820430287 is about 28643.1542781168. The cubic root of 820430287 is about 936.1538509215.

The spelling of 820430287 in words is "eight hundred twenty million, four hundred thirty thousand, two hundred eighty-seven".