690623 has 4 divisors (see below), whose sum is σ = 706728. Its totient is φ = 674520.

The previous prime is 690611. The next prime is 690629. The reversal of 690623 is 326096.

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

It is a cyclic number.

It is not a de Polignac number, because 690623 - 2⁴ = 690607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690592 and 690601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690629) 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, 7988 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (176682).

2⁶⁹⁰⁶²³ is an apocalyptic number.

690623 is a deficient number, since it is larger than the sum of its proper divisors (16105).

690623 is a wasteful number, since it uses less digits than its factorization.

690623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16104.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 690623 is about 831.0373036152. The cubic root of 690623 is about 88.3921462690.

The spelling of 690623 in words is "six hundred ninety thousand, six hundred twenty-three".