641624 has 16 divisors (see below), whose sum is σ = 1213800. Its totient is φ = 317952.

The previous prime is 641623. The next prime is 641633. The reversal of 641624 is 426146.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 641624.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641623) 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, 824 + ... + 1400.

2⁶⁴¹⁶²⁴ is an apocalyptic number.

It is an amenable number.

641624 is a deficient number, since it is larger than the sum of its proper divisors (572176).

641624 is a wasteful number, since it uses less digits than its factorization.

641624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 718 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 641624 is about 801.0143569250. The cubic root of 641624 is about 86.2502177408.

Subtracting from 641624 its sum of digits (23), we obtain a square (641601 = 801²).

The spelling of 641624 in words is "six hundred forty-one thousand, six hundred twenty-four".