685408122 has 64 divisors (see below), whose sum is σ = 1743379200. Its totient is φ = 195531840.

The previous prime is 685408121. The next prime is 685408151. The reversal of 685408122 is 221804586.

It is not an unprimeable number, because it can be changed into a prime (685408121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400204 + ... + 401912.

It is an arithmetic number, because the mean of its divisors is an integer number (27240300).

Almost surely, 2^685408122 is an apocalyptic number.

685408122 is an abundant number, since it is smaller than the sum of its proper divisors (1057971078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685408122 is a wasteful number, since it uses less digits than its factorization.

685408122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788 (or 2782 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 685408122 is about 26180.3002656578. The cubic root of 685408122 is about 881.6910158373.

The spelling of 685408122 in words is "six hundred eighty-five million, four hundred eight thousand, one hundred twenty-two".