685390810 has 16 divisors (see below), whose sum is σ = 1328603976. Its totient is φ = 253067328.

The previous prime is 685390799. The next prime is 685390829. The reversal of 685390810 is 18093586.

It is a happy number.

685390810 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 621853969 + 63536841 = 24937^2 + 7971^2 .

It is a super-2 number, since 2×685390810² = 939521124864912200, which contains 22 as substring.

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, 2635989 + ... + 2636248.

Almost surely, 2^685390810 is an apocalyptic number.

685390810 is a deficient number, since it is larger than the sum of its proper divisors (643213166).

685390810 is a wasteful number, since it uses less digits than its factorization.

685390810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272257.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 685390810 is about 26179.9696332903. The cubic root of 685390810 is about 881.6835925407.

The spelling of 685390810 in words is "six hundred eighty-five million, three hundred ninety thousand, eight hundred ten".