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643622241 = 3479447893
BaseRepresentation
bin100110010111001…
…110010101100001
31122212002101201210
4212113032111201
52304231402431
6143511020333
721643461453
oct4627162541
91585071653
10643622241
11300342a09
1215b66a6a9
13a3460082
14616a02d3
153b787d46
hex265ce561

643622241 has 8 divisors (see below), whose sum is σ = 859956480. Its totient is φ = 428184752.

The previous prime is 643622137. The next prime is 643622251. The reversal of 643622241 is 142226346.

643622241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 643622241 - 27 = 643622113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643622199 and 643622208.

It is not an unprimeable number, because it can be changed into a prime (643622251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222510 + ... + 225383.

It is an arithmetic number, because the mean of its divisors is an integer number (107494560).

Almost surely, 2643622241 is an apocalyptic number.

It is an amenable number.

643622241 is a deficient number, since it is larger than the sum of its proper divisors (216334239).

643622241 is a wasteful number, since it uses less digits than its factorization.

643622241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448375.

The product of its digits is 13824, while the sum is 30.

The square root of 643622241 is about 25369.7110941374. The cubic root of 643622241 is about 863.3966270768.

Adding to 643622241 its reverse (142226346), we get a palindrome (785848587).

The spelling of 643622241 in words is "six hundred forty-three million, six hundred twenty-two thousand, two hundred forty-one".

Divisors: 1 3 479 1437 447893 1343679 214540747 643622241