684011705 has 16 divisors (see below), whose sum is σ = 884838864. Its totient is φ = 504610560.

The previous prime is 684011687. The next prime is 684011737. The reversal of 684011705 is 507110486.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 245486224 + 438525481 = 15668^2 + 20941^2 .

It is not a de Polignac number, because 684011705 - 2⁶ = 684011641 is a prime.

It is an unprimeable number.

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, 67895 + ... + 77315.

It is an arithmetic number, because the mean of its divisors is an integer number (55302429).

Almost surely, 2^684011705 is an apocalyptic number.

684011705 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

684011705 is a deficient number, since it is larger than the sum of its proper divisors (200827159).

684011705 is a wasteful number, since it uses less digits than its factorization.

684011705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10556.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 684011705 is about 26153.6174362171. The cubic root of 684011705 is about 881.0918373499.

The spelling of 684011705 in words is "six hundred eighty-four million, eleven thousand, seven hundred five".