624709 has 2 divisors, whose sum is σ = 624710. Its totient is φ = 624708.

The previous prime is 624707. The next prime is 624721. The reversal of 624709 is 907426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532900 + 91809 = 730^2 + 303^2 .

It is a cyclic number.

It is not a de Polignac number, because 624709 - 2¹ = 624707 is a prime.

It is a super-2 number, since 2×624709² = 780522669362, which contains 22 as substring.

Together with 624707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624707) by changing a digit.

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 as a sum of consecutive naturals, namely, 312354 + 312355.

It is an arithmetic number, because the mean of its divisors is an integer number (312355).

2⁶²⁴⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

624709 is a deficient number, since it is larger than the sum of its proper divisors (1).

624709 is an equidigital number, since it uses as much as digits as its factorization.

624709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 624709 is about 790.3853490545. The cubic root of 624709 is about 85.4855258605.

The spelling of 624709 in words is "six hundred twenty-four thousand, seven hundred nine".