624428 has 24 divisors (see below), whose sum is σ = 1293600. Its totient is φ = 258048.

The previous prime is 624419. The next prime is 624443. The reversal of 624428 is 824426.

It is a junction number, because it is equal to n+sod(n) for n = 624397 and 624406.

It is an unprimeable number.

624428 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 7 ways as a sum of consecutive naturals, for example, 428 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (53900).

2⁶²⁴⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 624428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (646800).

624428 is an abundant number, since it is smaller than the sum of its proper divisors (669172).

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

624428 is a wasteful number, since it uses less digits than its factorization.

624428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 807 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 624428 is about 790.2075676681. The cubic root of 624428 is about 85.4727065397.

The spelling of 624428 in words is "six hundred twenty-four thousand, four hundred twenty-eight".