684392086 has 32 divisors (see below), whose sum is σ = 1245404160. Its totient is φ = 275358336.

The previous prime is 684392081. The next prime is 684392099. The reversal of 684392086 is 680293486.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684392081) 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 15 ways as a sum of consecutive naturals, for example, 96291 + ... + 103153.

It is an arithmetic number, because the mean of its divisors is an integer number (38918880).

Almost surely, 2^684392086 is an apocalyptic number.

684392086 is a deficient number, since it is larger than the sum of its proper divisors (561012074).

684392086 is a wasteful number, since it uses less digits than its factorization.

684392086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7308.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 684392086 is about 26160.8884787960. Note that the first 3 decimals coincide. The cubic root of 684392086 is about 881.2551330385.

The spelling of 684392086 in words is "six hundred eighty-four million, three hundred ninety-two thousand, eighty-six".