690320 has 20 divisors (see below), whose sum is σ = 1605180. Its totient is φ = 276096.

The previous prime is 690293. The next prime is 690323. The reversal of 690320 is 23096.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 394384 + 295936 = 628^2 + 544^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 690292 and 690301.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690320.

It is not an unprimeable number, because it can be changed into a prime (690323) 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, 4235 + ... + 4394.

It is an arithmetic number, because the mean of its divisors is an integer number (80259).

2⁶⁹⁰³²⁰ is an apocalyptic number.

It is an amenable number.

690320 is an abundant number, since it is smaller than the sum of its proper divisors (914860).

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

690320 is a wasteful number, since it uses less digits than its factorization.

690320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8642 (or 8636 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 690320 is about 830.8549813295. The cubic root of 690320 is about 88.3792174891.

The spelling of 690320 in words is "six hundred ninety thousand, three hundred twenty".