820669306 has 16 divisors (see below), whose sum is σ = 1247599584. Its totient is φ = 404816944.

The previous prime is 820669277. The next prime is 820669313. The reversal of 820669306 is 603966028.

It is an unprimeable number.

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, 129201 + ... + 135403.

It is an arithmetic number, because the mean of its divisors is an integer number (77974974).

Almost surely, 2^820669306 is an apocalyptic number.

820669306 is a deficient number, since it is larger than the sum of its proper divisors (426930278).

820669306 is a wasteful number, since it uses less digits than its factorization.

820669306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7085.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 820669306 is about 28647.3263324869. The cubic root of 820669306 is about 936.2447531529.

The spelling of 820669306 in words is "eight hundred twenty million, six hundred sixty-nine thousand, three hundred six".