690265 has 4 divisors (see below), whose sum is σ = 828324. Its totient is φ = 552208.

The previous prime is 690259. The next prime is 690269. The reversal of 690265 is 562096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 456976 + 233289 = 676^2 + 483^2 .

It is a cyclic number.

It is not a de Polignac number, because 690265 - 2⁵ = 690233 is a prime.

It is a Duffinian number.

690265 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (690269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69022 + ... + 69031.

It is an arithmetic number, because the mean of its divisors is an integer number (207081).

2⁶⁹⁰²⁶⁵ is an apocalyptic number.

It is an amenable number.

690265 is a deficient number, since it is larger than the sum of its proper divisors (138059).

690265 is a wasteful number, since it uses less digits than its factorization.

690265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138058.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 690265 is about 830.8218822347. The cubic root of 690265 is about 88.3768702753.

The spelling of 690265 in words is "six hundred ninety thousand, two hundred sixty-five".