624240 has 120 divisors (see below), whose sum is σ = 2284080. Its totient is φ = 156672.

The previous prime is 624233. The next prime is 624241. The reversal of 624240 is 42426.

624240 is a `hidden beast` number, since 624 + 2 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624241) by changing a digit.

624240 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 in 23 ways as a sum of consecutive naturals, for example, 36712 + ... + 36728.

It is an arithmetic number, because the mean of its divisors is an integer number (19034).

2⁶²⁴²⁴⁰ is an apocalyptic number.

624240 is a gapful number since it is divisible by the number (60) 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 624240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142040).

624240 is an abundant number, since it is smaller than the sum of its proper divisors (1659840).

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

624240 is a wasteful number, since it uses less digits than its factorization.

624240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 624240 is about 790.0886026263. The cubic root of 624240 is about 85.4641277648.

Adding to 624240 its reverse (42426), we get a palindrome (666666).

The spelling of 624240 in words is "six hundred twenty-four thousand, two hundred forty".