690642 has 48 divisors (see below), whose sum is σ = 1653912. Its totient is φ = 207360.

The previous prime is 690629. The next prime is 690661. The reversal of 690642 is 246096.

It can be written as a sum of positive squares in 4 ways, for example, as 622521 + 68121 = 789^2 + 261^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690642.

It is an unprimeable number.

690642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11292 + ... + 11352.

2⁶⁹⁰⁶⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (826956).

690642 is an abundant number, since it is smaller than the sum of its proper divisors (963270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690642 is a wasteful number, since it uses less digits than its factorization.

690642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 690642 is about 831.0487350330. The cubic root of 690642 is about 88.3929568585.

The spelling of 690642 in words is "six hundred ninety thousand, six hundred forty-two".