690885 has 24 divisors (see below), whose sum is σ = 1290744. Its totient is φ = 339840.

The previous prime is 690871. The next prime is 690887. The reversal of 690885 is 588096.

It can be written as a sum of positive squares in 4 ways, for example, as 91809 + 599076 = 303^2 + 774^2 .

It is not a de Polignac number, because 690885 - 2⁴ = 690869 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (53781).

2⁶⁹⁰⁸⁸⁵ is an apocalyptic number.

690885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

690885 is a deficient number, since it is larger than the sum of its proper divisors (599859).

690885 is a wasteful number, since it uses less digits than its factorization.

690885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205 (or 1202 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 690885 is about 831.1949229874. The cubic root of 690885 is about 88.4033225617.

The spelling of 690885 in words is "six hundred ninety thousand, eight hundred eighty-five".