685351205 has 16 divisors (see below), whose sum is σ = 1025357184. Its totient is φ = 427231680.

The previous prime is 685351201. The next prime is 685351211. The reversal of 685351205 is 502153586.

It is not a de Polignac number, because 685351205 - 2² = 685351201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685351201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 889682 + ... + 890451.

It is an arithmetic number, because the mean of its divisors is an integer number (64084824).

Almost surely, 2^685351205 is an apocalyptic number.

It is an amenable number.

685351205 is a deficient number, since it is larger than the sum of its proper divisors (340005979).

685351205 is a wasteful number, since it uses less digits than its factorization.

685351205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780156.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 685351205 is about 26179.2132234718. The cubic root of 685351205 is about 881.6666096502. Note that the first 4 decimals are identical.

The spelling of 685351205 in words is "six hundred eighty-five million, three hundred fifty-one thousand, two hundred five".