624621 has 4 divisors (see below), whose sum is σ = 832832. Its totient is φ = 416412.

The previous prime is 624607. The next prime is 624643. The reversal of 624621 is 126426.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 624621 - 2¹⁹ = 100333 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104101 + ... + 104106.

It is an arithmetic number, because the mean of its divisors is an integer number (208208).

2⁶²⁴⁶²¹ is an apocalyptic number.

It is an amenable number.

624621 is a deficient number, since it is larger than the sum of its proper divisors (208211).

624621 is a wasteful number, since it uses less digits than its factorization.

624621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208210.

The product of its digits is 576, while the sum is 21.

The square root of 624621 is about 790.3296780458. The cubic root of 624621 is about 85.4815116825.

The spelling of 624621 in words is "six hundred twenty-four thousand, six hundred twenty-one".