690444 has 30 divisors (see below), whose sum is σ = 1805804. Its totient is φ = 230040.

The previous prime is 690439. The next prime is 690449. The reversal of 690444 is 444096.

It is an interprime number because it is at equal distance from previous prime (690439) and next prime (690449).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690444.

It is not an unprimeable number, because it can be changed into a prime (690449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 742 + ... + 1389.

2⁶⁹⁰⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

690444 is an abundant number, since it is smaller than the sum of its proper divisors (1115360).

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

690444 is a wasteful number, since it uses less digits than its factorization.

690444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147 (or 2136 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 690444 is about 830.9295999060. The cubic root of 690444 is about 88.3845089322.

The spelling of 690444 in words is "six hundred ninety thousand, four hundred forty-four".