690705 has 12 divisors (see below), whose sum is σ = 1197300. Its totient is φ = 368352.

The previous prime is 690689. The next prime is 690719. The reversal of 690705 is 507096.

It can be written as a sum of positive squares in 2 ways, for example, as 239121 + 451584 = 489^2 + 672^2 .

It is not a de Polignac number, because 690705 - 2⁴ = 690689 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7630 + ... + 7719.

It is an arithmetic number, because the mean of its divisors is an integer number (99775).

2⁶⁹⁰⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

690705 is a deficient number, since it is larger than the sum of its proper divisors (506595).

690705 is a wasteful number, since it uses less digits than its factorization.

690705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15360 (or 15357 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 690705 is about 831.0866380829. The cubic root of 690705 is about 88.3956444965.

The spelling of 690705 in words is "six hundred ninety thousand, seven hundred five".