624661 has 8 divisors (see below), whose sum is σ = 651200. Its totient is φ = 598752.

The previous prime is 624649. The next prime is 624667. The reversal of 624661 is 166426.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 624661 - 2⁹ = 624149 is a prime.

It is a Duffinian number.

624661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624667) 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 in 7 ways as a sum of consecutive naturals, for example, 3040 + ... + 3238.

It is an arithmetic number, because the mean of its divisors is an integer number (81400).

2⁶²⁴⁶⁶¹ is an apocalyptic number.

It is an amenable number.

624661 is a deficient number, since it is larger than the sum of its proper divisors (26539).

624661 is a wasteful number, since it uses less digits than its factorization.

624661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315.

The product of its digits is 1728, while the sum is 25.

The square root of 624661 is about 790.3549835359. The cubic root of 624661 is about 85.4833363556.

The spelling of 624661 in words is "six hundred twenty-four thousand, six hundred sixty-one".