624681 has 12 divisors (see below), whose sum is σ = 931840. Its totient is φ = 402840.

The previous prime is 624667. The next prime is 624683. The reversal of 624681 is 186426.

It is not a de Polignac number, because 624681 - 2⁵ = 624649 is a prime.

It is a super-2 number, since 2×624681² = 780452703522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

624681 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624683) 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 11 ways as a sum of consecutive naturals, for example, 841 + ... + 1398.

2⁶²⁴⁶⁸¹ is an apocalyptic number.

It is an amenable number.

624681 is a deficient number, since it is larger than the sum of its proper divisors (307159).

624681 is a wasteful number, since it uses less digits than its factorization.

624681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276 (or 2273 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 624681 is about 790.3676359771. The cubic root of 624681 is about 85.4842486630.

The spelling of 624681 in words is "six hundred twenty-four thousand, six hundred eighty-one".