690624 has 84 divisors (see below), whose sum is σ = 2179320. Its totient is φ = 207360.

The previous prime is 690611. The next prime is 690629. The reversal of 690624 is 426096.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690629) by changing a digit.

690624 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 11 ways as a sum of consecutive naturals, for example, 6282 + ... + 6390.

2⁶⁹⁰⁶²⁴ is an apocalyptic number.

690624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1089660).

690624 is an abundant number, since it is smaller than the sum of its proper divisors (1488696).

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

690624 is a wasteful number, since it uses less digits than its factorization.

690624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 125 counting only the distinct ones).

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

The square root of 690624 is about 831.0379052727. The cubic root of 690624 is about 88.3921889319.

The spelling of 690624 in words is "six hundred ninety thousand, six hundred twenty-four".