624420 has 36 divisors (see below), whose sum is σ = 1894620. Its totient is φ = 166464.

The previous prime is 624419. The next prime is 624443. The reversal of 624420 is 24426.

624420 is a `hidden beast` number, since 624 + 42 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 97344 + 527076 = 312^2 + 726^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 624393 and 624402.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 624420.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1555 + ... + 1914.

2⁶²⁴⁴²⁰ is an apocalyptic number.

624420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

624420 is an abundant number, since it is smaller than the sum of its proper divisors (1270200).

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

624420 is a wasteful number, since it uses less digits than its factorization.

624420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484 (or 3479 counting only the distinct ones).

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

The square root of 624420 is about 790.2025056908. The cubic root of 624420 is about 85.4723415205.

Adding to 624420 its reverse (24426), we get a palindrome (648846).

The spelling of 624420 in words is "six hundred twenty-four thousand, four hundred twenty".