690944 has 18 divisors (see below), whose sum is σ = 1379700. Its totient is φ = 345344.

The previous prime is 690929. The next prime is 690953. The reversal of 690944 is 449096.

It is a happy number.

It is a super-2 number, since 2×690944² = 954807222272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 690944.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690944.

It is an unprimeable number.

690944 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 as a sum of consecutive naturals, namely, 1094 + ... + 1605.

It is an arithmetic number, because the mean of its divisors is an integer number (76650).

2⁶⁹⁰⁹⁴⁴ is an apocalyptic number.

690944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

690944 is a deficient number, since it is larger than the sum of its proper divisors (688756).

690944 is an equidigital number, since it uses as much as digits as its factorization.

690944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715 (or 2701 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 690944 is about 831.2304133031. The cubic root of 690944 is about 88.4058389706.

The spelling of 690944 in words is "six hundred ninety thousand, nine hundred forty-four".